The file index.rst
should look like
.. Arrays documentation master file, created by
sphinx-quickstart on Wed Oct 16 15:33:52 2019.
You can adapt this file completely to your liking, but it should at least
contain the root `toctree` directive.
Welcome to Arrays's documentation!
==================================
.. toctree::
:maxdepth: 2
:caption: Contents:
This documentation site is all about the arrays module and how to use it.
Indices and tables
==================
* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`
and should create an output like: