Enable the todo extension to allow using the todo directive

Author: stof

conf.py

@@ -29,7 +29,9 @@
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-#extensions = []
+extensions = [
+    'sphinx.ext.todo',
+]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['theme/_templates']