feat(docs): add FCC icon

Author: nikerzetic-aflabs

src/css/custom.css

@@ -345,6 +345,7 @@ div[class^="searchBar_"] div[class*="hitFooter"] a:hover {
 .menu__link[href*="/network/overview"]::before,
 .menu__link[href*="/run-node"]::before,
 .menu__link[href*="/ftso/overview"]::before,
+.menu__link[href*="/fcc/overview"]::before,
 .menu__link[href*="/fdc/overview"]::before,
 .menu__link[href*="/fassets/overview"]::before,
 .menu__link[href*="/fxrp/overview"]::before,
@@ -391,6 +392,17 @@ div[class^="searchBar_"] div[class*="hitFooter"] a:hover {
   background-image: url("/img/ui/ftso.dark.svg");
 }
 
+.menu__link[href*="/fcc/overview"]::before {
+  width: 26px;
+  height: 26px;
+  background-size: 26px 26px;
+  background-image: url("/img/ui/fcc.light.svg");
+}
+
+[data-theme="dark"] .menu__link[href*="/fcc/overview"]::before {
+  background-image: url("/img/ui/fcc.dark.svg");
+}
+
 .menu__link[href*="/fdc/overview"]::before {
   width: 26px;
   height: 26px;