Add RefHeap plugin to Emacs

More info on RefHeap: https://github.com/Raynes/refheap and
https://www.refheap.com/

More info on the plugin: https://github.com/Raynes/refheap.el
Reorder XMonad layouts

Arranged by usage
Consistently name install scripts
Update package install script

- Remove unused packages
- Document install functions
- Install packages from npm by default