docs: generate packages sidebar from filesystem & group @lexical/react

[etrepum]

• Generate the packages list from the filesystem (the collection of docs from README.md files)
• Group generated API modules from the @lexical/react package into a sidebar category of their own

Compare:

• lexical.dev/docs/api
• updated /docs/api

It took a few tries to get this right, but as far as I can tell it matches the expected output now without any unintended changes to the sidebar order or label names.

Something to explore as a separate docs follow-up would be to adjust the font size of the titles on the module pages. Since we are using fully qualified module names, a lot of them wrap at 3rem. That's an easy one for someone else :)

RE #5869 this helps fix up one of the many places that manual configuration is used, and can be done independently from #5876 since this is isolated to lexical-website.

Resolves #5916 Resolves #5913

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 20, 2024 11:40pm
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 20, 2024 11:40pm