Update index.html

WordPress archived the packages repo and moved everything into the Gutenberg Project.  See:

WordPress/packages@5e4f4f4
WordPress/gutenberg#7556

index.html

@@ -288,7 +288,7 @@ <h2>
             <li><a href="https://github.com/sterjakovigor/vqua">sterjakovigor/vqua</a></li>
             <li><a href="https://github.com/wireapp/wire-web-packages">wireapp/wire-web-packages</a></li>
             <li><a href="https://github.com/klis87/redux-saga-requests">klis87/redux-saga-requests</a></li>
-            <li><a href="https://github.com/WordPress/packages">WordPress/packages</a></li>
+            <li><a href="https://github.com/WordPress/gutenberg">WordPress/gutenberg</a></li>
             <li><a href="https://github.com/react-cosmos/react-cosmos">react-cosmos/react-cosmos</a></li>
             <li><a href="https://github.com/jsbites/jedifocus-monorepo">jsbites/jedifocus-monorepo</a></li>
             <li><a href="https://github.com/FoalTS/foal">FoalTS/foal</a></li>