One of the bigger changes is to make the setup hardware-independent
which is nice for easier (re-)installations.
Finally about time it happens.
Another big thing is the update of the README, now with some
self-reminding pitch why choose NixOS (or something similar like GuixSD)
which could be nice for other people too, provided they've come across
my NixOS config.
I made the module docstrings a bit more consistent (though still
useless, to be honest).
I've also updated config for Visual Studio Code.