🔍️ Improve markdown anchor tokens and targets

Author: pboling

CONTRIBUTING.md

@@ -4,7 +4,9 @@ Bug reports and pull requests are welcome on GitLab at [https://gitlab.com/oauth
 . This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to
 the [code of conduct][conduct].
 
-To submit a patch, please fork the project and create a patch with tests. Once you're happy with it send a pull request!
+To submit a patch, please fork the project and create a patch with
+tests. Once you're happy with it send a pull request and post a message to the
+[google group][mailinglist] or on the [gitter chat][🏘chat].
 
 ## Detailed instructions on Submitting a Pull Request
 1. [Fork the repository.][fork]
@@ -27,18 +29,13 @@ To submit a patch, please fork the project and create a patch with tests. Once y
 
 ## Contributors
 
-[![Contributors](https://contrib.rocks/image?repo=oauth-xx/oauth2)][🚎contributors]
+See: [https://gitlab.com/oauth-xx/oauth2/-/graphs/main][🚎contributors]
 
 Made with [contributors-img][contrib-rocks].
 
-[comment]: <> (Following links are used by README, CONTRIBUTING)
-
+[comment]: <> (Following links are used by README, CONTRIBUTING, Homepage)
 [conduct]: https://gitlab.com/oauth-xx/oauth2/-/blob/main/CODE_OF_CONDUCT.md
-
-[contrib-rocks]: https://contrib.rocks
-
 [🚎contributors]: https://gitlab.com/oauth-xx/oauth2/-/graphs/main
-
-[comment]: <> (Following links are used by README, CONTRIBUTING, Homepage)
-
+[mailinglist]: http://groups.google.com/group/oauth-ruby
 [🚎src-main]: https://gitlab.com/oauth-xx/oauth2/-/tree/main
+[🏘chat]: https://gitter.im/oauth-xx/oauth2