https://pages.github.com/ https://gitbook.com (isn’t for github)
https://jekyllrb.com/ (isn’t for github) https://github.com/pages-themes (used jekyll) https://pages.github.com/themes/
http://jekyllthemes.org/ https://github.com/andreondra/jekyll-theme-simplex
https://www.markdownguide.org/getting-started/
astro https://astro.build/themes/details/minted-directory/
hugo https://github.com/alex-shpak/hugo-book https://themes.gohugo.io/ https://github.com/panr/hugo-theme-terminal