[ImgBot] Optimize images (#237)

*Total -- 42,877.14kb -> 41,490.25kb (3.23%)

/build/curriculum/english/animation-assets/images/characters/bob/sweat.png -- 5.37kb -> 1.52kb (71.63%)
/build/curriculum/english/animation-assets/images/characters/james/sweat.png -- 5.49kb -> 1.69kb (69.2%)
/build/curriculum/english/animation-assets/images/characters/linda/sweat.png -- 5.67kb -> 1.91kb (66.22%)
/build/curriculum/english/animation-assets/images/characters/sarah/sweat.png -- 3.75kb -> 1.56kb (58.54%)
/build/curriculum/english/animation-assets/images/characters/anna/sweat.png -- 3.76kb -> 1.56kb (58.47%)
/build/curriculum/english/animation-assets/images/characters/maria/sweat.png -- 3.86kb -> 1.63kb (57.66%)
/build/curriculum/english/animation-assets/images/characters/jake/sweat.png -- 3.94kb -> 1.75kb (55.6%)
/build/curriculum/english/animation-assets/images/characters/npc/woman.png -- 222.41kb -> 110.12kb (50.49%)
/build/curriculum/english/animation-assets/images/characters/npc/boy.png -- 196.11kb -> 98.71kb (49.67%)
/build/curriculum/english/animation-assets/images/characters/npc/girl.png -- 169.27kb -> 85.90kb (49.25%)
/build/curriculum/english/animation-assets/images/characters/npc/man.png -- 253.10kb -> 130.18kb (48.57%)
/build/curriculum/english/animation-assets/images/characters/tom/sweat.png -- 3.74kb -> 2.15kb (42.57%)
/build/curriculum/english/animation-assets/images/characters/david/sweat.png -- 3.67kb -> 2.12kb (42.33%)
/build/curriculum/english/animation-assets/images/characters/lisa/sweat.png -- 3.75kb -> 2.18kb (41.86%)
/build/curriculum/english/animation-assets/images/characters/tom/mouth-frowned.png -- 6.68kb -> 4.27kb (36.14%)
/build/curriculum/english/animation-assets/images/characters/james/glasses.png -- 9.07kb -> 6.19kb (31.8%)
/build/curriculum/english/animation-assets/images/characters/lisa/mouth-serious.png -- 5.36kb -> 3.68kb (31.48%)
/build/curriculum/english/animation-assets/images/characters/sarah/brows-frown.png -- 6.04kb -> 4.14kb (31.41%)
/build/curriculum/english/animation-assets/images/characters/tom/mouth-smile.png -- 5.52kb -> 3.79kb (31.34%)
/build/curriculum/english/animation-assets/images/characters/tom/mouth-serious.png -- 5.44kb -> 3.74kb (31.28%)
/build/curriculum/english/animation-assets/images/characters/anna/brows-raised.png -- 5.96kb -> 4.10kb (31.25%)
/build/curriculum/english/animation-assets/images/characters/maria/brows-sad.png -- 5.72kb -> 3.94kb (31.16%)
/build/curriculum/english/animation-assets/images/characters/lisa/mouth-smile.png -- 5.51kb -> 3.80kb (31.08%)
/build/curriculum/english/animation-assets/images/characters/maria/brows-normal.png -- 5.92kb -> 4.08kb (31.06%)
/build/curriculum/english/animation-assets/images/characters/anna/brows-confused.png -- 5.89kb -> 4.07kb (30.97%)
/build/curriculum/english/animation-assets/images/characters/linda/brows-suspicious.png -- 5.96kb -> 4.11kb (30.95%)
/build/curriculum/english/animation-assets/images/characters/james/brows-angry.png -- 5.93kb -> 4.10kb (30.81%)
/build/curriculum/english/animation-assets/images/characters/james/brows-neutral.png -- 5.92kb -> 4.10kb (30.77%)
/build/curriculum/english/animation-assets/images/characters/linda/brows-neutral.png -- 5.89kb -> 4.08kb (30.75%)
/build/curriculum/english/animation-assets/images/characters/linda/brows-confused.png -- 5.81kb -> 4.03kb (30.69%)
/build/curriculum/english/animation-assets/images/characters/james/brows-confused.png -- 5.75kb -> 3.99kb (30.66%)
/build/curriculum/english/animation-assets/images/characters/anna/brows-neutral.png -- 6.09kb -> 4.22kb (30.58%)
/build/curriculum/english/animation-assets/images/characters/sarah/brows-normal.png -- 5.94kb -> 4.13kb (30.57%)
/build/curriculum/english/animation-assets/images/characters/lisa/brows-confused.png -- 6.06kb -> 4.21kb (30.53%)
/build/curriculum/english/animation-assets/images/characters/lisa/brows-neutral.png -- 6.10kb -> 4.25kb (30.26%)
/build/curriculum/english/animation-assets/images/characters/tom/eyes-closed.png -- 6.70kb -> 4.69kb (30.02%)
/build/curriculum/english/animation-assets/images/characters/lisa/eyes-closed.png -- 6.43kb -> 4.52kb (29.69%)
/build/curriculum/english/animation-assets/images/characters/lisa/eyes-laugh.png -- 7.07kb -> 4.97kb (29.64%)
/build/curriculum/english/animation-assets/images/characters/david/eyes-closed.png -- 6.79kb -> 4.79kb (29.44%)
/build/curriculum/english/animation-assets/images/characters/david/base.png -- 265.58kb -> 206.88kb (22.11%)
/build/curriculum/english/animation-assets/images/characters/tom/blush.png -- 20.67kb -> 16.50kb (20.17%)
/build/curriculum/english/animation-assets/images/characters/linda/blush.png -- 13.78kb -> 11.18kb (18.88%)
/build/curriculum/english/animation-assets/images/characters/tom/base.png -- 206.71kb -> 169.42kb (18.04%)
/build/curriculum/english/animation-assets/images/characters/anna/base.png -- 307.94kb -> 256.54kb (16.69%)
/build/curriculum/english/animation-assets/images/characters/james/base.png -- 338.21kb -> 285.69kb (15.53%)
/build/curriculum/english/animation-assets/images/characters/maria/base.png -- 299.48kb -> 256.67kb (14.3%)
/build/curriculum/english/animation-assets/images/characters/lisa/base.png -- 153.20kb -> 131.76kb (13.99%)
/build/curriculum/english/animation-assets/images/characters/brian/base.png -- 321.04kb -> 276.30kb (13.94%)
/build/curriculum/english/animation-assets/images/characters/sarah/base.png -- 280.32kb -> 241.31kb (13.91%)
/build/curriculum/english/animation-assets/images/characters/alice/base.png -- 286.18kb -> 249.55kb (12.8%)
/build/curriculum/english/animation-assets/images/characters/bob/base.png -- 281.07kb -> 245.18kb (12.77%)
/build/curriculum/english/animation-assets/images/characters/sophie/base.png -- 242.56kb -> 216.19kb (10.87%)
/build/curriculum/english/animation-assets/images/characters/linda/base.png -- 217.57kb -> 200.67kb (7.77%)
/build/curriculum/english/animation-assets/images/characters/sophie/glasses.png -- 12.75kb -> 12.11kb (4.98%)
/build/curriculum/english/animation-assets/images/characters/lisa/eyes-open.png -- 11.05kb -> 10.63kb (3.84%)
/build/curriculum/english/animation-assets/images/characters/maria/glasses.png -- 18.08kb -> 17.42kb (3.65%)
/build/curriculum/english/animation-assets/images/characters/jake/base.png -- 242.84kb -> 234.93kb (3.26%)
/build/curriculum/english/animation-assets/images/characters/david/eyes-open.png -- 10.21kb -> 9.88kb (3.2%)
/build/curriculum/english/animation-assets/images/characters/anna/eyes-closed.png -- 15.79kb -> 15.33kb (2.91%)
/build/curriculum/english/animation-assets/images/backgrounds/park3.png -- 1,123.95kb -> 1,107.50kb (1.46%)
/build/curriculum/english/animation-assets/images/backgrounds/park4.png -- 1,156.40kb -> 1,139.52kb (1.46%)
/build/curriculum/english/animation-assets/images/backgrounds/park1.png -- 1,103.41kb -> 1,087.61kb (1.43%)
/build/curriculum/english/animation-assets/images/backgrounds/company3-roof.png -- 995.52kb -> 981.28kb (1.43%)
/build/curriculum/english/animation-assets/images/backgrounds/tunnel.png -- 904.01kb -> 891.27kb (1.41%)
/build/curriculum/english/animation-assets/images/backgrounds/company2-roof.png -- 955.08kb -> 942.00kb (1.37%)
/build/curriculum/english/animation-assets/images/backgrounds/park2.png -- 1,103.29kb -> 1,088.21kb (1.37%)
/build/curriculum/english/animation-assets/images/backgrounds/company2-center.png -- 921.27kb -> 908.77kb (1.36%)
/build/curriculum/english/animation-assets/images/backgrounds/company1-boardroom.png -- 807.91kb -> 797.28kb (1.32%)
/build/curriculum/english/animation-assets/images/backgrounds/company2-parking.png -- 906.76kb -> 894.98kb (1.3%)
/build/curriculum/english/animation-assets/images/backgrounds/company3-center.png -- 874.38kb -> 863.10kb (1.29%)
/build/curriculum/english/animation-assets/images/backgrounds/company2-dining.png -- 820.83kb -> 811.01kb (1.2%)
/build/curriculum/english/animation-assets/images/backgrounds/company1-dining.png -- 793.79kb -> 784.45kb (1.18%)
/build/curriculum/english/animation-assets/images/backgrounds/company2-breakroom.png -- 779.63kb -> 770.58kb (1.16%)
/build/curriculum/english/animation-assets/images/backgrounds/company3-reception.png -- 756.19kb -> 747.49kb (1.15%)
/build/curriculum/english/animation-assets/images/backgrounds/company3-breakroom.png -- 818.44kb -> 809.11kb (1.14%)
/build/curriculum/english/animation-assets/images/backgrounds/kid-home.png -- 731.15kb -> 722.82kb (1.14%)
/build/curriculum/english/animation-assets/images/backgrounds/company1-lydia-cubicle.png -- 705.19kb -> 697.28kb (1.12%)
/build/curriculum/english/animation-assets/images/backgrounds/company3-dining.png -- 806.75kb -> 797.75kb (1.11%)
/build/curriculum/english/animation-assets/images/backgrounds/company3-boardmeeting.png -- 757.88kb -> 749.50kb (1.11%)
/build/curriculum/english/animation-assets/images/backgrounds/interview-room1.png -- 675.91kb -> 668.45kb (1.1%)
/build/curriculum/english/animation-assets/images/backgrounds/company2-boardroom.png -- 782.83kb -> 774.28kb (1.09%)
/build/curriculum/english/animation-assets/images/backgrounds/company3-lydia-cubicle.png -- 762.55kb -> 754.23kb (1.09%)
/build/curriculum/english/animation-assets/images/backgrounds/company2-lydia-cubicle.png -- 804.06kb -> 795.29kb (1.09%)
/build/curriculum/english/animation-assets/images/backgrounds/office-cafe.png -- 708.48kb -> 700.90kb (1.07%)
/build/curriculum/english/animation-assets/images/backgrounds/company1-roof.png -- 952.43kb -> 942.38kb (1.05%)
/build/curriculum/english/animation-assets/images/backgrounds/company1-parking.png -- 802.93kb -> 794.63kb (1.03%)
/build/curriculum/english/animation-assets/images/backgrounds/company1-reception.png -- 716.72kb -> 709.32kb (1.03%)
/build/curriculum/english/animation-assets/images/backgrounds/company2-reception.png -- 750.04kb -> 742.47kb (1.01%)
/build/curriculum/english/animation-assets/images/backgrounds/interview-room3.png -- 726.55kb -> 719.24kb (1.01%)
/build/curriculum/english/animation-assets/images/backgrounds/hacker-space-cafe.png -- 752.84kb -> 745.27kb (1.01%)
/build/curriculum/english/animation-assets/images/backgrounds/interview-room2.png -- 620.42kb -> 614.21kb (1%)
/build/curriculum/english/animation-assets/images/backgrounds/bedroom-empty.png -- 571.68kb -> 566.00kb (0.99%)
/build/curriculum/english/animation-assets/images/backgrounds/company1-breakroom.png -- 732.22kb -> 725.18kb (0.96%)
/build/curriculum/english/animation-assets/images/backgrounds/chaos.png -- 508.07kb -> 503.24kb (0.95%)
/build/curriculum/english/animation-assets/images/backgrounds/cafe.png -- 835.30kb -> 827.46kb (0.94%)
/build/curriculum/english/animation-assets/images/backgrounds/farm.png -- 814.05kb -> 806.53kb (0.92%)
/build/curriculum/english/animation-assets/images/backgrounds/office.png -- 723.25kb -> 716.58kb (0.92%)
/build/curriculum/english/animation-assets/images/backgrounds/company1-center.png -- 761.72kb -> 755.17kb (0.86%)
/build/curriculum/english/animation-assets/images/backgrounds/hall.png -- 762.14kb -> 755.62kb (0.86%)
/build/curriculum/english/animation-assets/images/backgrounds/classroom.png -- 673.86kb -> 668.13kb (0.85%)
/build/curriculum/english/animation-assets/images/backgrounds/cubicle.png -- 705.12kb -> 699.42kb (0.81%)
/build/curriculum/english/animation-assets/images/backgrounds/kitchen.png -- 631.55kb -> 626.63kb (0.78%)
/build/curriculum/english/animation-assets/images/backgrounds/hacker-space.png -- 654.47kb -> 649.39kb (0.78%)
/build/curriculum/english/animation-assets/images/backgrounds/living-room.png -- 707.10kb -> 701.66kb (0.77%)
/build/curriculum/english/animation-assets/images/characters/sarah/eyes-open.png -- 14.38kb -> 14.29kb (0.66%)
/build/curriculum/english/animation-assets/images/backgrounds/hall-audience.png -- 574.68kb -> 571.09kb (0.62%)
/build/curriculum/english/animation-assets/images/backgrounds/company3-parking.png -- 755.28kb -> 750.58kb (0.62%)
/build/curriculum/english/animation-assets/images/backgrounds/desk.png -- 507.02kb -> 503.92kb (0.61%)
/build/curriculum/english/animation-assets/images/characters/tom/eyes-open.png -- 11.25kb -> 11.18kb (0.61%)
/build/curriculum/english/animation-assets/images/backgrounds/pong-field.png -- 22.51kb -> 22.45kb (0.26%)
/build/curriculum/english/animation-assets/images/backgrounds/laptop-screen.png -- 451.48kb -> 450.46kb (0.23%)

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