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/shell/config.nix

@@ -1,5 +1,6 @@
 {
   config,
+  inputs,
   lib,
   pkgs,
   ...
@@ -14,11 +15,9 @@
     description = "The shell to use system-wide (bash or zsh)";
   };
   config = {
-    users.users = let
-      userLib = import ../lib.nix { inherit lib; };
-    in lib.mkMerge (map (user: {
+    users.users = lib.mkMerge (map (user: {
       ${user}.shell = pkgs.${config.my.shell.type};
-    }) (userLib.normalizeUsers config.my.toggleUsers.shell));
+    }) (inputs.self.lib.normalizeUsers config.my.toggleUsers.shell));
     programs.zsh.enable = config.my.shell.type == "zsh";
   };
 }