automate generating list of contributors

Author: joelhawksley

docs/CONTRIBUTING.md

@@ -53,9 +53,8 @@ The codespace environment includes a minimal Rails app with ViewComponent instal
 3. Create a new branch: `git checkout -b my-branch-name`.
 4. Add tests, make the change, and make sure the tests still pass.
 5. Add an entry to the top of `docs/CHANGELOG.md` for the changes, no matter how small.
-6. If it's your first time contributing, add yourself to `docs/index.md`.
-7. Push to the fork and [submit a pull request](https://github.com/viewcomponent/view_component/compare).
-8. Wait for the pull request to be reviewed and merged.
+6. Push to the fork and [submit a pull request](https://github.com/viewcomponent/view_component/compare).
+7. Wait for the pull request to be reviewed and merged.
 
 ### Running a subset of tests