Remove Gitter reference

Author: chadlwilson

Diff for: README.md

@@ -988,7 +988,9 @@ dojo
 
 # Issues and questions
 
- * If you have **questions on usage**, please ask them on the [gitter chat room dedicated for configrepo-plugins](https://gitter.im/gocd/configrepo-plugins?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+ * If you have **questions on usage**, please ask them on the GoCD [Google Groups forum](https://groups.google.com/g/go-cd) or 
+[GitHub Discussions](https://github.com/gocd/gocd/discussions).
+
  * If you think there is a bug, or you have an idea for a feature and *you are not sure if it's plugin's or [GoCD](https://github.com/gocd/gocd/issues) fault/responsibity*, please ask on the chat first too.
 
 Please note this brief overview of what is done by the plugin: