Framework support for nitro

[pi0]

Describe the solution you'd like

Nitro is a server (builder) framework powered by unjs/h3 and used under the hood by Nuxt (and more) but is also a standalone server builder working perfectly on stackblitz ❤️

I think it would be so much beneficial for the community if we add nitro to the "Backend" section in stack blitz

Provide a link to a GitHub repo containing an example of the framework

https://stackblitz.com/github/unjs/nitro/tree/main/examples/hello-world?file=package.json

Additional context

Related: H3 support #8