Link issue tracker in contributing docs (#5688)

## Summary

This adds links to issue categories that are good for people looking to
implement something and a link to the contributing guide feedback issue
(#5684)

---------

Co-authored-by: Zanie <contact@zanie.dev>

CONTRIBUTING.md

@@ -23,7 +23,9 @@ For small changes (e.g., bug fixes), feel free to submit a PR.
 For larger changes (e.g., new lint rules, new functionality, new configuration options), consider
 creating an [**issue**](https://github.com/astral-sh/ruff/issues) outlining your proposed change.
 You can also join us on [**Discord**](https://discord.gg/c9MhzV8aU5) to discuss your idea with the
-community.
+community. We have labeled [beginner-friendly tasks in the issue tracker](https://github.com/astral-sh/ruff/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22)
+as well as [bugs](https://github.com/astral-sh/ruff/issues?q=is%3Aissue+is%3Aopen+label%3Abug) and
+[improvements that are ready for contributions](https://github.com/astral-sh/ruff/issues?q=is%3Aissue+is%3Aopen+label%3Aaccepted).
 
 If you're looking for a place to start, we recommend implementing a new lint rule (see:
 [_Adding a new lint rule_](#example-adding-a-new-lint-rule), which will allow you to learn from and
@@ -34,6 +36,8 @@ As a concrete example: consider taking on one of the rules from the [`flake8-pyi
 plugin, and looking to the originating [Python source](https://github.com/PyCQA/flake8-pyi) for
 guidance.
 
+If you have suggestions on how we might improve the contributing documentation, [let us know](https://github.com/astral-sh/ruff/discussions/5693)!
+
 ### Prerequisites
 
 Ruff is written in Rust. You'll need to install the