Add Emacs configuration back

There was a moment I decided GUI text editors are shit. So, I was
right, sometimes it is more productive to write code in console
text editors. Now I use Vim.

But before Vim I was using Emacs for a significant amount of time.
Emacs made my wrists hurt so badly that one day I just threw it away
and started using Vim.

Still, I probably want to use it sometimes. Nevertheless I don't really
like GNU programs. Just in case I am moving configs back in the repo.