Merge pull request #3131 from ethereum/ryestew-patch-2

Update index.rst

Author: ryestew

docs/index.rst

@@ -41,7 +41,7 @@ Useful links:
 
 - `Remix on Twitter <https://twitter.com/EthereumRemix>`__
 
-- `Our Gitter support channel <https://gitter.im/ethereum/remix>`__
+- `Our Discord support channel <https://discord.gg/ZZSGegD7jm>`__
 
 - `Ethereum.org's Developer resources <https://ethereum.org/en/developers/>`__