If using Codio, put on the certified Python stack Python Ubuntu 22.04 (pyenv).
pip install sphinx==4.2.0 sphinx-sitemap sphinx_code_tabs recommonmark git+https://github.com/codio/pydata-sphinx-theme.git@master
python3 -m sphinx source build
make html
If inside Codio, you can use the Make rocketship button on the Codio menu
Navigate using a web-browser to: https://{{domain}}/build/html/index.html
If inside Codio, you can use the Preview play button on the Codio menu.