Updated default html_theme per Sphinx updates
Updated default html_theme per Sphinx updates

asandyz/pep8,PyCQA/pep8,codeclimate/pep8,ABaldwinHunter/pep8-clone-classic,MeteorAdminz/pep8,pandeesh/pep8,ABaldwinHunter/pep8,zevnux/pep8,pedros/pep8