chore(docs): Fix Discord link

Author: benvinegar

README.md

@@ -171,7 +171,7 @@ Each example includes the exact command to run from the repository root.
 
 ## Contributing
 
-💬 _Join us on the Modem Discord: https://discord.gg/MKkTFvQ4_
+💬 _Chat with users/contributors on the [Modem Discord server](https://discord.gg/WZFjaP6Gt8)_
 
 For source setup, tests, packaging checks, and repo architecture, see [CONTRIBUTING.md](CONTRIBUTING.md).