Merge my fork on latest setup instructions, esp. macOS and Emacs

[ed9w2in6]

Thanks for your work!
However I have recently decided to stop using it but for those who are interested consider updating the setup instructions to my fork here:
https://github.com/ed9w2in6/icons-in-terminal/

I have originally wrote some notes for my own use only so I am not submitting a pull request, sorry about that.

This should reduce the amount of confusion, especially for macOS and Emacs users.

Useful issues that helped my setup process:
#1