remove empty folder
Squashed 'src/sphinx/module_tutorial/_theme/sphinx_rtd_theme/' content from commit b83f5ad

git-subtree-dir: src/sphinx/module_tutorial/_theme/sphinx_rtd_theme
git-subtree-split: b83f5adf977fc5cba494ebe9182009f634ce9bd2
Merge commit '20dfa9cb2baf777bfc851555f2b2dc449f5f2b61' as 'src/sphinx/module_tutorial/_theme/sphinx_rtd_theme'
enable custom theme