ReadTheDocs.org builds are still failing. This follows the suggestion in
the build failure by using the `.readthedocs.yml` config file to specify
some of the build instructions.
Also, somehow the `sphinx-markdown-tables` dependency was omitted in the
`requirements.txt` file, which was the root problem I was battling.
Verification that this is _actually_ building now, srsly:
Signed-off-by: Justin W. Flory <email@example.com>