feat: show gitcoin banner and update link to gitcoin grants 21

[marcomariscal]

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[apbendi]

LGTM!

[github-actions]

Coverage after merging feat/enable-gg21-banner into master will be

80.54%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
contracts-periphery/src
UmbraBatchSend.sol	100%	100%	100%	100%
UniswapWithdrawHook.sol	80%	100%	66.67%	83.33%	14
umbra-js/src
ethers.ts	76.27%	100%	61.11%	100%
types.ts	50%	100%	0%	100%
umbra-js/src/classes
KeyPair.ts	98.65%	96.49%	100%	100%	31–32
RandomNumber.ts	100%	100%	100%	100%
StealthKeyRegistry.ts	100%	100%	100%	100%
TxHistoryProvider.ts	77.55%	76.47%	66.67%	79.31%	11, 11, 19–20, 31, 38, 44, 53, 57, 8
Umbra.ts	82.51%	75%	85%	86.61%	106, 136–137, 158, 230–232, 316–319, 381, 395, 402–404, 406–407, 410–411, 434, 437, 437, 437, 439, 439, 439, 439–440, 440, 440–442, 457, 457, 457–458, 462, 465, 485, 503–505, 592, 609, 622–623, 633–634, 647, 650–651, 681–682, 751, 755, 758–759, 765–767, 774, 774, 774–777, 808, 813–814, 814–815
umbra-js/src/typechain
index.ts	70.59%	100%	37.50%	100%
umbra-js/src/typechain/factories
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@OpenZeppelin
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts/access
Ownable__factory.ts	50%	100%	0%	66.67%	70, 76
index.ts	50%	100%	0%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts/token
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts/token/ERC20
ERC20__factory.ts	29.03%	0%	12.50%	47.06%	310, 314, 314, 314–315, 317, 326, 326, 326, 333, 333, 333, 336, 339, 345
IERC20__factory.ts	50%	100%	0%	66.67%	201, 204
index.ts	50%	100%	0%	100%
umbra-js/src/typechain/factories/contracts
IUmbraHookReceiver__factory.ts	50%	100%	0%	66.67%	61, 67
MockHook__factory.ts	22.58%	0%	0%	41.18%	107, 111, 111, 111–112, 114, 121, 121, 121, 126, 126, 126, 129, 132, 138, 144
StealthKeyRegistry__factory.ts	22.58%	0%	0%	41.18%	202, 206, 206, 206–207, 209, 216, 216, 216, 221, 221, 221, 224, 227, 233, 239
TestToken__factory.ts	64.52%	66.67%	50%	70.59%	329–330, 348, 351, 354, 360, 366
Umbra__factory.ts	70.97%	66.67%	62.50%	76.47%	495–496, 525, 529, 532, 538
index.ts	50%	100%	0%	100%
umbra-js/src/utils
cns.ts	50%	33.33%	50%	55%	33–36, 40, 40, 40, 40, 40–41, 44–46
constants.ts	100%	100%	100%	100%
ens.ts	36.11%	25%	33.33%	40%	25–27, 35, 56–57, 57, 57–58, 63–64, 66, 70, 70, 70, 70, 70–71, 75–77
utils.ts	72.03%	65.76%	80%	75.58%	102, 102, 118–120, 122–124, 130, 148–149, 178, 199, 256, 259, 264, 268, 272, 282, 294–299, 301–308, 308, 308, 308, 308, 308, 308–309, 311, 334–335, 335, 335–336, 340–341, 351, 351, 351–353, 355, 371–373, 401, 421, 425, 428, 428–429, 429, 429–430, 430, 432, 436–437, 447, 451, 461, 464, 464, 464–466, 496, 498–499, 508, 508, 508–509, 511, 514, 523–524, 565, 582, 582, 582, 602, 631, 633, 638, 650, 650–651, 656, 658–659, 670–674, 68, 680, 682, 69, 724–725, 725, 725–727, 727, 727, 738, 94, 981–982, 994–995
umbra-js/test
testPrivateKeys.ts	100%	100%	100%	100%
utils.ts	100%	100%	100%	100%