Improve styles

[fisxoj]

Figure out how to hook into cl-docutils so that the output is more modern and pleasant...

Prior art:

• https://marshmallow.readthedocs.io/en/3.0/quickstart.html#serializing-objects-dumping
• https://docs.python.org/2/library/itertools.html#itertools.combinations
• https://doc.rust-lang.org/std/string/struct.String.html

Might be able to snag a stylesheet from one of the python ones since maybe they're using something docutils like.