What if I told you there’s a way to bypass GitHub’s Jekyll plugin whitelist limitation, and that it comes directly from GitHub?
GitHub
A collection of 3 posts
Build Jekyll with custom plugins on GitHub Pages
Using Forestry as a CMS for Jekyll
Jekyll is a wonderful system for quick static sites, but adding posts is a bit hard for the non-programmers. That isn't the case anymore, with Forestry.

Jekyll 101
Jekyll is a useful system for templates and blog posts that works for static sites. Here's how you can use it.