Todo

Docs

Build READMEs, guides, and source docs.
Unify docs w.r.t. code references (e.g. :py:meth:\`~api.RestApi\`)
Host on readthedocs.

Type-hinting

Redo everything, make use of TypeVar/Generic where needed.

Unit-tests

Finish conversion to pytest and responses.
Provide coverage report.
Implement CI.