Expose RSS feed

[pi0]

Ref: #33

I think since we are migrating to Nuxt3, would be best if we directly implement it with a Nitro API route

[antfu]

Guess that would be nice to have a new module for Nuxt 3 based on Nitro?

[pi0]

@antfu Sure we probably need also a major rewrite on nuxt-community/feed for Nuxt3 support. However, is out of scope of this project, we can directly see how it will look like with Nuxt3 here and inspire for rewrite.