Sort out installing config files and scripts

[sminez]

Currently there are Makefile targets for setting up the config directory if you clone the repo and build from source, but installing via cargo wont handle this out of the box I don't think? It is possible to embed the config directory into the editor binary itself using something like rust-embed but that might not be the best way to go so some investigation into alternative methods should be carried out first.

[sschober]

A short notice in the README would have helped me. :)

[sminez]

fair 😅