PYTHON-907 - Fix MANIFEST.in for doc theme changes.
PYTHON-907 - Fix MANIFEST.in for doc theme changes.

jameslittle/mongo-python-driver,ramnes/mongo-python-driver,gormanb/mongo-python-driver,ameily/mongo-python-driver,develf/mongo-python-driver,pigate/mongo-python-driver,mongodb/mongo-python-driver,brianwrf/mongo-python-driver,aherlihy/mongo-python-driver,develf/mongo-python-driver,mongodb/mongo-python-driver,jameslittle/mongo-python-driver,mongodb/mongo-python-driver,ramnes/mongo-python-driver,ameily/mongo-python-driver,WingGao/mongo-python-driver,felixonmars/mongo-python-driver,inspectlabs/mongo-python-driver,ramnes/mongo-python-driver,ultrabug/mongo-python-driver,brianwrf/mongo-python-driver,ShaneHarvey/mongo-python-driver,rychipman/mongo-python-driver,rychipman/mongo-python-driver,macdiesel/mongo-python-driver,ShaneHarvey/mongo-python-driver,aherlihy/mongo-python-driver,bq-xiao/mongo-python-driver,felixonmars/mongo-python-driver,aherlihy/mongo-python-driver,inspectlabs/mongo-python-driver,ShaneHarvey/mongo-python-driver,pigate/mongo-python-driver,macdiesel/mongo-python-driver,bq-xiao/mongo-python-driver,gormanb/mongo-python-driver,WingGao/mongo-python-driver,ultrabug/mongo-python-driver