Check out Tips for publishing Python Sphinx with Free Hosting on GitHub Pages by annegentle. Here is an excerpt:
Here’s a new article on the Docs Like Code site, titled “Yes You Can Use GitHub Pages with Python Sphinx.” If you’re familiar with GitHub Pages, you may also know that by default it builds Jekyll sites and uses selectable Jekyll themes. Jekyll itself mostly publishes with Markdown. For fans of…
The full article is available here.