Update doc index with captions

docs/source/index.rst

@@ -3,16 +3,37 @@ The Jupyter notebook
 ====================
 
 .. toctree::
-    :maxdepth: 2
-
-    notebook
-    config
-    public_server
-    security
-    extending/index
-    development
-    examples/Notebook/Examples and Tutorials Index
-    changelog
+   :maxdepth: 2
+   :caption: User Documentation
+
+   notebook
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Configuration
+
+   config
+   public_server
+   security
+   extending/index
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Developer Documentation
+
+   development
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Community documentation
+   
+   examples/Notebook/Examples and Tutorials Index
+
+.. toctree::
+   :maxdepth: 2
+   :caption: About Jupyter Notebook
+
+   changelog
 
 
 .. _old-notebook-docs: