title: Section titles in the Sphinx sidebar
body: <p>Is there any way to add section titles in the left menu of Sphinx documentation?
  I know you can do it if you use MkDocs (for example <a href="http://dp.readthedocs.org/en/latest/" rel="nofollow">here</a>), but is there a way to do this in Sphinx and ReSTructured text?</p>
  
  <p>I want to divide my documentation into separate sections (e.g. Installation instructions, Running the program, etc.), with the titles of those sections appearing as text in the left menu.</p>