You can use the github-pages gem to install jekyll locally in the same way github does during build. It installs various plugins and uses a default configuration if you don’t specify one.
The default theme is jekyll-theme-primer.
You can find this theme’s files by running bundle info --path jekyll-theme-primer.
Default Configuration. Jekyll • Simple, blog-aware, static sites.
github/pages-gem. GitHub. A simple Ruby Gem to bootstrap dependencies for setting up and maintaining a local Jekyll environment in sync with GitHub Pages.
GitHub - pages-themes/primer: Primer is a Jekyll theme for GitHub Pages. GitHub.
Jekyll Theme Primer. Jekyll Theme Primer.
About GitHub Pages and Jekyll. GitHub Docs.
Dependency versions. GitHub Pages. GitHub Pages uses the following dependencies and versions.