doc: Update Discord links with invites that never expire

Author: sgillespie

Readme.md

@@ -1,5 +1,5 @@
 [![Haskell CI](https://img.shields.io/github/actions/workflow/status/intersectmbo/cardano-db-sync/haskell.yml?branch=master&style=for-the-badge)](https://github.com/intersectmbo/cardano-db-sync/actions/workflows/haskell.yml)
-[![Discord](https://img.shields.io/discord/1136727663583698984?style=for-the-badge&color=blue)](https://discord.gg/3DYwebJv)
+[![Discord](https://img.shields.io/discord/1136727663583698984?style=for-the-badge&color=blue)](https://discord.gg/GXrTvmzHQN)
 
 # Cardano DB Sync
 
@@ -74,7 +74,7 @@ above is met).
 
 You can discuss development or find help at the following places:
 
- * Intersect Discord [#db-sync](https://discord.com/channels/1136727663583698984/1239888910537064468) channel, if new to server invite [here](https://discord.gg/3DYwebJv)
+ * Intersect Discord [#db-sync](https://discord.com/channels/1136727663583698984/1239888910537064468) channel, if new to server invite [here](https://discord.gg/GXrTvmzHQN)
  * [GitHub Issues](https://github.com/IntersectMBO/cardano-db-sync/issues)
 
 ## Installation