docs: remove Discord chat rooms section (#6807)

www/docs/getting-started/support.mdx

@@ -10,18 +10,12 @@ sidebar_position: 5
 you are trying to do. Make sure you tag your question with
 `react-bootstrap`. You can also read through [existing React-Bootstrap questions][1].
 
-## Chat rooms
-
-Discuss questions in the `#react-bootstrap`
-channel on the [Reactiflux Discord][2].
-
 ## GitHub issues
 
 The issue tracker is the preferred channel for bug reports, features
 requests and submitting pull requests. See more about how we use issues
-in the [contribution guidelines][3].
+in the [contribution guidelines][2].
 
 [0]: http://stackoverflow.com/questions/ask
 [1]: http://stackoverflow.com/questions/tagged/react-bootstrap
-[2]: https://discord.gg/AKfs9vpvRW
-[3]: https://github.com/react-bootstrap/react-bootstrap/blob/master/CONTRIBUTING.md#issues
+[2]: https://github.com/react-bootstrap/react-bootstrap/blob/master/CONTRIBUTING.md#issues