use classic theme for HTML docs

docs/conf.py

@@ -43,7 +43,7 @@ exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store', 'sphinx-build', 'sphinx-
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'alabaster'
+html_theme = 'classic'
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,