Below is an eample of Fidus Writers unified HTML document (uhtml) being rendered in GitHub pages as a replacement for using Markdown in Github Pages. The goal of using HTML for GitHub pages is to remove the Markdown conversion stage as Markdown cannot cope with complex tables and footnotes and references without adding complexity. In this instance the HTMl is being outputted into the Docsify CSS and styling, with an additional ToC rendering.
https://tibhannover.github.io/ADA-Reference-Publication/
Notes and Project issue tracker:
Notes: HTML for GitHub Pages wiki
Project: HTML for GitHub Pages project
Unified HTML
HTML multi-file
Unpacked epub -
Using the OPF from epub
Using the nav.xhtml from epub