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Cleanup and more tooling
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* Removed the ``__version__`` attribute. It's unnecessary and adds fragile
manual maintenance overhead.
* This would normally be considered a breaking change, but I'm pretty sure no
one's using this yet, much less depending on that attribute being present
* Added the ``black`` code formatter to the development stack
* Applied it to both code and tests
* Mostly just converted all strings to double-quotes
* Removed ``pylint-quotes`` now that ``black`` has been added
* Added source code link and badge to ``README.rst`` for easier navigation from
readthedocs.io
* Switched ``pip_install`` to ``false`` in ``readthedocs.io``
* Added documentation around the style-enforcement tools and other conventions
* Cleaned up some documentation
* Added several project url attributes to ``pyproject.toml`` in the hopes that
poetry and PyPI will display the relative links on the project page.
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