Need to install ourselves so that we can introspect on version
using `setuptools_scm` in `docs/conf.py`.
Signed-off-by: Milas Bowman <milas.bowman@docker.com>
* Upgrade to latest Sphinx / recommonmark
* Small CSS fix for issue in new version of Alabaster theme
* Fix `Makefile` target for macOS
Signed-off-by: Milas Bowman <milas.bowman@docker.com>