docs: documentation missing

[ntcho]

/docs directory existed until v5 but it disappeared on v6.

If there is a way to auto-generate them, I'll add a PR with the docs.

[transitive-bullshit]

It would need to use https://typedoc.org/

The previous version had errors and was out-of-date, so I removed it for now.

If we get a solid version working with the latest release, that'd be awesome.

[mnik01]

👍🏻
This project really needs good docs!