Nearly all the options in our setup.py can be moved over to setup.cfg.

The only things that need to stay are:

1. use_scm_version (I believe there is no declarative option for this)
2. The README configuration, which involves modifying the README
3. cmdclass, which I think has no declarative alternative

The trickiest part will be converting the find_packages option over, but that is covered in the setuptools documentation I linked to, you specify it as packages = find:, and then pass the options in [options.packages.find].

For bonus points, we may be able to switch over the README thing by switching README over to using .. code-block :: python3 directly, and then doing a search-and-replace as part of the docs build instead. This will be a bit tricky, though, because README.rst is included in the docs with an RST include, which means we would have to create a temporary file that would be included. For now, this ticket can be closed if we do everything except that.