You can further customize your GitHub Pages site by adding Jekyll plugins.
GitHub Pages officially supports the Jekyll plugins found in the GitHub Pages gem. For the exact versions of the Jekyll plugins that GitHub Pages supports, see this list of GitHub Pages dependencies. Other plugins are not supported, so the only way to incorporate them in your site is to generate your site locally and then push your site's static files to your GitHub Pages site.
You must edit your _config.yml file to add Jekyll plugins to your GitHub Pages site.
GitHub Pages can automatically create sitemaps for your projects.
GitHub Pages can optimize your site for search engines and social media networks, using the Jekyll SEO tag plugin.
Common repository information, such as the project name and description, is available to Jekyll sites hosted on GitHub Pages.
GitHub Pages can automatically create an Atom feed for your Jekyll blog. Atom is an XML-based feed format, similar to RSS, that allows other readers to subscribe to new blog posts.
When a Jekyll post or page's title or date changes, existing links to the site may break. For the security of our users, GitHub Pages does not support customer server configuration files such as
.conf. However, using the Jekyll Redirect From plugin, you can automatically redirect visitors to the updated URL.
You can use emoji within any Jekyll page or post, just like you would in a comment or issue within a repository on GitHub.
You can use @mentions within any Jekyll page or post, just like you would in a comment or issue within a repository.