Implement Read the Docs support for python documentation

[benknoll-umn]

Currently we self-host python documentation, which doesn't allow for versioned documentation. We should switch to hosting the python documentation on Read the docs.

Read the docs is currently failing because it uses setup.py install instead of pip install

Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/mtap/checkouts/v1.1.0/setup.py", line 18, in <module>
    import importlib_resources
ModuleNotFoundError: No module named 'importlib_resources'

This should be configurable via a .readthedocs.yaml configuration file.