What problem does this feature solve?

We should be able to follow project release blog posts thanks to a RSS feed.

For example, I'd like to be notified whenever there is a new release here:
https://rsbuild.dev/community/releases/

Docusaurus blogs have this out of the box: https://docusaurus.io/blog/rss.xml

What does the proposed API look like?

No idea what the API should look like sorry 😅 Maybe it's not even a goal of this project, or maybe it should be part of the "blog theme" that is in the roadmap? (#133)

### Tasks