docs: rm dead link (#3086)

Author: MSalopek

docs/docs/index.mdx

@@ -82,7 +82,6 @@ Have questions, comments, or new ideas? Participate in the Cosmos community thro
 
 * [Cosmos Community Discord](https://discord.gg/cosmosnetwork)
 * [Cosmos Community Telegram](https://t.me/cosmosproject)
-* [Cosmos Hub Governance Working Group Telegram](https://t.me/hubgov)
 * [Cosmos Forum](https://forum.cosmos.network)
 * [Cosmos on Reddit](https://reddit.com/r/cosmosnetwork)