Add open issues tip to contributing page (withastro#12124)

Co-authored-by: ascorbic <[email protected]>

Author: sarah11918

src/content/docs/en/contribute.mdx

@@ -7,6 +7,10 @@ import ContributorList from '~/components/ContributorList.astro'
 
 We welcome contributions of any size and contributors of any skill level. As an open-source project, we believe in giving back to our contributors. We are happy to help with guidance on PRs, technical writing, and turning any feature idea into a reality.
 
+:::tip[Open Issues]
+Browse [all of Astro's open GitHub issues tagged `help wanted` and `good first issues`](https://github.com/search?q=org%3Awithastro+label%3A%22good+first+issue%22%2C%22help+wanted%22%2C+state%3Aopen&type=issues) for all the code repositories: Astro code, documentation, Starlight, Astro websites, language tools, GitHub Actions, bots, the compiler... there are lots of places to contribute!
+:::
+
 Want to get even more involved? See our [Governance doc](https://github.com/withastro/.github/blob/main/GOVERNANCE.md) for detailed descriptions of different roles, maintainer nomination processes, code review processes, and Code of Conduct enforcement.
 
 ## Ways to Contribute