Refactor user management functions to use inputs

Removed the `lib.nix` file and refactored various modules to utilize `inputs.self.lib` for user package and attribute management. This change enhances consistency and maintainability across the configuration files.

modules/modules.nix

@@ -111,13 +111,15 @@ in
         shell = "jawz";
         scripts = "jawz";
         services = "jawz";
+        stylix = "jawz";
       };
       description = "Map toggle categories to users. Can be a single user (string) or multiple users (list). Determines which user(s) get packages from each toggle category.";
       example = {
         apps = "jawz";
         dev = "bearded_dragonn";
         shell = "jawz";
-        gaming = [ "jawz" "bearded_dragonn" ];  # Install gaming on both users
+        gaming = [ "jawz" "bearded_dragonn" ];
+        stylix = [ "jawz" "bearded_dragonn" ];
       };
     };
   };