This doc folder is the location of documentation for Subiquity.
In the not distant past, there was also a ../documentation folder, but that
is now an obsolete copy of what was on Discourse.
To build this documentation, you can run make install from this folder to
create the virtual environment.
Then run the make run command, which will build a html version of the docs,
and serve the docs in the virtual environment. This is very convenient if you
are working on them and want your saved changes to be reflected as a working
preview.