Refactor the whole codebase. Most notable changes:

- No more fail2ban. It didn't work properly
  anyways, I'll need to look into this in the future
- No nix-super. I don't need it and the overlay is
  broken so I'm waiting for that to be fixed first.
- Uses nh instead of nixos-rebuild. This is much
  better.

lib/values.nix

@@ -1,18 +1,19 @@
-{
-  enabled = attributes: attributes // {
-    enable = true;
-  };
-
+lib: {
   normalUser = attributes: attributes // {
     isNormalUser = true;
   };
 
+  sudoUser = attributes: attributes // {
+    isNormalUser = true;
+    extraGroups  = [ "wheel" ] ++ attributes.extraGroups or [];
+  };
+
+  desktopUser = attributes: attributes // {
+    isNormalUser  = true;
+    isDesktopUser = true; # Defined in options/desktop.nix.
+  };
+
   systemUser = attributes: attributes // {
     isSystemUser = true;
   };
-
-  graphicalUser = attributes: attributes // {
-    isNormalUser = true;
-    extraGroups  = [ "graphical" ] ++ attributes.extraGroups or []; 
-  };
 }