Docs: Make previewing in development easier

When needing to work on docs, I find the following a little cumbersome

psf-salt$ cd docs
psf-salt/docs$ make html && python -m http.server

It would be nice to have

hot-reloading (sphinx-autobuild?)
A Makefile target in the root of the repo so that we could just run make docs-serve or something to only need a oneshot command to get going

I agree that some online option would be a benefit.

As a note, docs can be built with the tox target tox -e docs

sphinx-autobuild is very handy, we have a make htmllive using it for the devguide, CPython docs and PEPs repos. For example:

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