Merge branch 'sethgitlab-contributiondoc' into 'master'

Updated contribution doc

See merge request gitlab-org/gitlab!17830

doc/development/contributing/index.md

@@ -62,8 +62,7 @@ Please help other GitLab users when you can.
 The methods people will use to seek help can be found on the [getting help page](https://about.gitlab.com/get-help/).
 
 Sign up for the mailing list, answer GitLab questions on StackOverflow or
-respond in the IRC channel. You can also sign up on [CodeTriage](https://www.codetriage.com/gitlabhq/gitlabhq) to help with
-the remaining issues on the GitHub issue tracker.
+respond in the IRC channel. 
 
 ## I want to contribute