Improved index page headers

Author: emiliom

docs/source/index.rst

@@ -3,9 +3,11 @@ ODM2 Python API (odm2api)
 
 A Python-based application programmer's interface for the `Observations Data Model 2 (ODM2) <http://www.odm2.org>`__. Development of ``odm2api`` is done at `<https://github.com/ODM2/ODM2PythonAPI/>`_.
 
+Contents
+--------
+
 .. toctree::
    :maxdepth: 2
-   :caption: Contents:
 
    getstarted
    odm2models
@@ -14,7 +16,7 @@ A Python-based application programmer's interface for the `Observations Data Mod
    credits
 
 Indices and Search
-==================
+-----------------
 
 .. toctree::
    :maxdepth: 2