title: How to include the toctree in the sidebar of each page
body: <p>I'm generating html documentation in Sphinx.</p>
  
  <p>How do I modify the sidebar for each of the html pages in my document so that they include the toctree?  By default the toctree only seems to display in the <code>master_doc</code> page, and only in the main area instead of the sidebar.</p>
  
  <p>Is there an easy way to do this?  I'll be using readthedocs to host the generated documentation, so I would prefer to avoid the use of any third-party plugins, unless they are also available on readthedocs.</p>