Add toc to sphinx sidebar

docs/conf.py

@@ -138,7 +138,7 @@ html_static_path = []
 # This is required for the alabaster theme
 # refs: http://alabaster.readthedocs.io/en/latest/installation.html#sidebars
 html_sidebars = {
-    '**': []
+    '**': ['about.html', 'localtoc.html', 'sourcelink.html']
 }