Add community adapters section to documentation

[Joehoel]

Related to #787. It would be nice to have a section to find the community adapters in the sidebar.

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[franky47]

I wonder if we should move the community adapters & parsers into their own section, maybe at some point we could also share community recipes (parser definitions + custom hooks, à la shadcn/ui).

[Joehoel]

Maybe a section like this?

- Adapters
  - Built in
  - Community
- Parsers
  - ...

[franky47]

That could work too. I was thinking more like:

** Getting started **
- Installation
- Adapters
- Basic usage

** Guides **
...

** Going further **
...

** Community **
- Adapters
  - Inertia
  - One
- Parsers
  - Date & Time
  - Map & Set
  - Compound parsers
  - TanStack Table

The idea with the "Getting started" section is to keep it as lean as possible, to avoid losing newcomers with a ton of options. The official adapters are likely the most used, and so for other folks it'd be a little indirection through the community section and back to the docs.