First Install Sphinx:

pip install -U sphinx
# Install the dependencies like mobile friendly [`sphinx_rtd_theme` style theme](here https://github.com/rtfd/sphinx_rtd_theme)
cd docs && pip install -r requirements.txt

If setting up the sphinx doc for the first time for a project, run

cd docs && sphinx-quickstart

This will create the conf.py template in source. You can customize it for your needs. See VISSL's conf.py as an example.

cd docs && make html

Now you can see the generated html index.html under build/html/. Send a PR.

As you make changes to the doc, you can view the updated html docs. For this, tart a simple python server:

# you can pick whatever port you want to use
python -m http.server 8097

Navigate to: http://0.0.0.0:8097/