Enable external contributions would be helpful

I did not notice that it was limited (might be an extra case for #149) and got a PR ready for the initial setup and onboarding improvements: 

https://github.com/githubnext/chopin/compare/main...rajbos:github-vnext-chopin:main?expand=1

<img width="1439" height="755" alt="Image" src="https://github.com/user-attachments/assets/c6c717f5-67d2-4ed8-bbe4-b1d58e630a68" />

Let me know if you want it 😄 