How to include the toctree in the sidebar of each page

You can customize your html sidebar in conf.py.

The default html sidebar consists of 4 templates:

['localtoc.html', 'relations.html', 'sourcelink.html', 'searchbox.html']

In conf.py you could change localtoc.html to globaltoc.html like this:

html_sidebars = { '**': ['globaltoc.html', 'relations.html', 'sourcelink.html', 'searchbox.html'] }

Since this in the end this will be used in HTML files, this should work on ReadTheDocs.