Liquid tag for displaying GitHub Gists in Jekyll sites

 Jekyll::Gist is plugin provides for Liquid tag in order to displaying
 GitHub Gists in Jekyll sites, like: `{% gist %}`.
 .
 If you provide a personal access token with Gist scope, as the environmental
 variable JEKYLL_GITHUB_TOKEN, Jekyll Gist will use the Gist API to speed up
 site generation.