Jekyll without Plugins
Use Jekyll without plugins instead of using restricted custom plugins since these custom plugins might not work on Github Pages.
Here is a list of features to use Jekyll without plugins.
Reading Time
Similar to Medium you can show the time it will take to read the blog post.
Setup: Jekyll Reading Time for Blog Posts
Search Box
You can also install a search bar.
Setup: Install a Jekyll Search Bar
Text Expand/Collapse or Collapbsible Markdown
I often add whole output to every command I use. This can take a large space in a blog post and might disrupt reading focus.