restructured directories + modularized btrfs mount

services/printing.nix

@@ -0,0 +1,13 @@
+{ config, lib, pkgs, ... }:
+let printingDrivers = [ pkgs.hplip pkgs.hplipWithPlugin ];
+in {
+  services.printing = {
+    enable = true;
+    drivers = printingDrivers;
+  };
+  hardware.sane = {
+    enable = true;
+    extraBackends = printingDrivers;
+  };
+  users.users.jawz.packages = [ pkgs.gnome.simple-scan ];
+}