docs: Use a documentation framework for docs

[fuma-nama]

Just noticed Content Collections on GitHub, thanks for the nice library!

The Problem

The current docs of Content Collection doesn't support search, and I think it can look better with a docs framework.

I understand some maintainers may prefer a simple docs implementation, so please tell me if you have any opinions about the docs.

The Solution

I want to migrate the docs to Fumadocs, and is willing to submit a PR:

• Fumadocs supports Content Collections
• It is very flexible, and is dedicated on Next.js (which the docs is using now)

Alternatives

Other docs frameworks like Nextra and Vitepress may also be a good option.

[sdorra]

I understand some maintainers may prefer a simple docs implementation, so please tell me if you have any opinions about the docs.

I originally wanted to implement a search with MiniSearch as I've done on my blog, but I also have no problem using a framework. I have no experience with Fumadocs, but I would be happy to accept a PR if it fits into the design.