Drop sphinx mocking.
Drop sphinx mocking.

Sphinx' mocking doesn't work for us since the objects aren't
subscriptable, which is a problem for the parted fileSystemType
attributes in format classes. We haven't had working docs on RTD
for a long time anyway, so just drop all of this crud for now.

rvykydal/blivet,jkonecny12/blivet,AdamWill/blivet,vpodzime/blivet,AdamWill/blivet,vojtechtrefny/blivet,rvykydal/blivet,jkonecny12/blivet,vojtechtrefny/blivet,rhinstaller/blivet,rhinstaller/blivet,vpodzime/blivet