Review footer block grid layout at different breakpoints

[irinaz]

@irinaz will provide wishlist for grid for these spans for each breakpoint

XS: 0 - 575px

all spans take full width (12 span)

SM: 576 - 767px

MD: 768 - 991px

LG: 992 - 1199px

XL: 1200 - 1499px
2XL: 1500px and up

List of spans

.col-span-12
.col-span-9
.col-span-8
.col-span-6
.col-span-4
.col-span-3
.col-span-2

.col-full
.col-half
.col-quarter
.col-third
.col-twothird
.col-threequarter

[irinaz]

@ronan , let me know if this list is sufficient or I need to add more details. If always using 12-grid layout makes it easier to maintain theme we can skip supporting 4-grid layout. users can always set classes within 12-grid.