Added BTC logo to chain icons mapping and scss (#155)

src/components/ChainIconGroup.scss

@@ -116,6 +116,11 @@
   @include chain-icon
 }
 
+.btc.chain.icon {
+  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' xmlns:xodm='http://www.corel.com/coreldraw/odm/2003' xml:space='preserve' width='24' height='24' version='1.1' shape-rendering='geometricPrecision' text-rendering='geometricPrecision' image-rendering='optimizeQuality' fill-rule='evenodd' clip-rule='evenodd' viewBox='0 0 4091.27 4091.73'%3E%3Cg id='Layer_x0020_1'%3E%3Cmetadata id='CorelCorpID_0Corel-Layer'/%3E%3Cg id='_1421344023328'%3E%3Cpath fill='%23F7931A' fill-rule='nonzero' d='M4030.06 2540.77c-273.24,1096.01 -1383.32,1763.02 -2479.46,1489.71 -1095.68,-273.24 -1762.69,-1383.39 -1489.33,-2479.31 273.12,-1096.13 1383.2,-1763.19 2479,-1489.95 1096.06,273.24 1763.03,1383.51 1489.76,2479.57l0.02 -0.02z'/%3E%3Cpath fill='white' fill-rule='nonzero' d='M2947.77 1754.38c40.72,-272.26 -166.56,-418.61 -450,-516.24l91.95 -368.8 -224.5 -55.94 -89.51 359.09c-59.02,-14.72 -119.63,-28.59 -179.87,-42.34l90.16 -361.46 -224.36 -55.94 -92 368.68c-48.84,-11.12 -96.81,-22.11 -143.35,-33.69l0.26 -1.16 -309.59 -77.31 -59.72 239.78c0,0 166.56,38.18 163.05,40.53 90.91,22.69 107.35,82.87 104.62,130.57l-104.74 420.15c6.26,1.59 14.38,3.89 23.34,7.49 -7.49,-1.86 -15.46,-3.89 -23.73,-5.87l-146.81 588.57c-11.11,27.62 -39.31,69.07 -102.87,53.33 2.25,3.26 -163.17,-40.72 -163.17,-40.72l-111.46 256.98 292.15 72.83c54.35,13.63 107.61,27.89 160.06,41.3l-92.9 373.03 224.24 55.94 92 -369.07c61.26,16.63 120.71,31.97 178.91,46.43l-91.69 367.33 224.51 55.94 92.89 -372.33c382.82,72.45 670.67,43.24 791.83,-303.02 97.63,-278.78 -4.86,-439.58 -206.26,-544.44 146.69,-33.83 257.18,-130.31 286.64,-329.61l-0.07 -0.05zm-512.93 719.26c-69.38,278.78 -538.76,128.08 -690.94,90.29l123.28 -494.2c152.17,37.99 640.17,113.17 567.67,403.91zm69.43 -723.3c-63.29,253.58 -453.96,124.75 -580.69,93.16l111.77 -448.21c126.73,31.59 534.85,90.55 468.94,355.05l-0.02 0z'/%3E%3C/g%3E%3C/g%3E%3Cscript xmlns='' id='bw-fido2-page-script'/%3E%3C/svg%3E");
+  @include chain-icon
+}
+
 .random.chain.icon {
   background-color: colors.$gray-100;
   height: 24px;

src/data/chain-icon-mapping.ts

@@ -18,7 +18,8 @@ const chainIconMapping: Record<string, string> = {
   bird: 'bird chain icon',
   trx: 'trx chain icon',
   celo: 'celo chain icon',
-  heco: 'heco chain icon'
+  heco: 'heco chain icon',
+  btc: 'btc chain icon'
 }
 
 export { chainIconMapping }