Have new projects use the Furo theme for Sphinx, and update pre-commit job versions

[ScriptAutomate]

• Shift to furo theme for docs
• Extend noxfile.py for more docs stuff
• Update pre-commit reqs
• Drop py3.5 from pre-commit config reqs

I, admittedly, couldn't properly get the nox command nox -e docs to work at all on a new project. It would just continuously fail. But I didn't want to remove it entirely, so I added different nox commands that did work in case I may have been missing something. This PR does remove the old nox -e docs job in favor of the new docs jobs, but that does mean that it currently does not include make linkcheck and make coverage as Sphinx tests.

I also wonder whether I should be dropping the pre-commit configs that focus on using pip-compile because nox purely references the setup.cfg rather than requirements/* now, and doesn't make a tree unless someone explicitly does so.

[s0undt3ch]

Remove the old docs target of the new ones do the work needed.

[ScriptAutomate]

Remove the old docs target of the new ones do the work needed.

I've now removed the older nox -e docs jobs in favor of newer doc-html and docs-dev jobs. I've also updated the original description of this PR with more info. I'm wondering whether certain pre-commit information should potentially be removed or simply stay.