Move docs to material-mkdocs

Pipfile

@@ -71,10 +71,9 @@ pytest-django = "*"
 pytest-env = "*"
 pytest-sugar = "*"
 pytest-xdist = "*"
-sphinx = "~=5.3"
-sphinx_rtd_theme = "*"
 tox = "*"
 black = "*"
 pre-commit = "*"
 sphinx-autobuild = "*"
 myst-parser = "*"
+mkdocs-material = "*"