Add hatch scripts to build, serve and watch the docs + docs improvements

[jtpio]

A couple of improvements to the docs setup:

• Add hatch script to serve the docs
• Use sphinx-autobuild to watch the docs
• Remove the previous Makefile
• Mention building the docs in CONTRIBUTING.md
• Convert more .rst to .md
• Remove "Background" from the nav bar, add "Changelog" and "FAQ" for visibility:

[jtpio]

The check-links failure is expected, and should resolve itself after merging:

[krassowski]

Do we have to remove makefiles or is it just that there is a different way these are no longer needed? I just wonder how much of a burden keeping them is, it feels pretty standard to be able to use make for sphinx compliation.

[jtpio]

I think the motivation here was to to keep it simple and have the hatch scripts be the recommended way for building the docs. And ReadTheDocs can build the docs without the Makefiles.

Also Makefiles tend to look complicated (although it could be more of a personal opinion).

[jtpio]

But if they are used by maintainers / contributors of this repo then we could keep them yes.

[krassowski]

Also Makefiles tend to look complicated (although it could be more of a personal opinion).

True

But if they are used by maintainers / contributors of this repo then we could keep them yes.

I would probably switch to hatch commands, not sure about other contributors.

[jtpio]

Thanks @krassowski for the review!