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/services/printing.nix

@@ -1,5 +1,6 @@
 {
   config,
+  inputs,
   lib,
   pkgs,
   ...
@@ -14,9 +15,8 @@ in
   options.my.services.printing.enable = lib.mkEnableOption "printing services and drivers";
   config = lib.mkIf config.my.services.printing.enable {
     users.users = let
-      userLib = import ../lib.nix { inherit lib; };
       packages = [ pkgs.simple-scan ];
-    in userLib.mkUserPackages config.my.toggleUsers.services packages;
+    in inputs.self.lib.mkUserPackages lib config.my.toggleUsers.services packages;
     services.printing = {
       enable = true;
       drivers = printingDrivers;