feat(users): add enable option

modules/users/default.nix

@@ -1,10 +1,18 @@
-{ config, ... }:
+{ lib, config, ... }:
 
 {
+  options.my.users.enable = lib.mkEnableOption "user account";
+
+  config = lib.mkIf config.my.users.enable {
     users.users.${config.host.username} = {
       isNormalUser = true;
       description = config.host.username;
-    extraGroups = [ "wheel" ];
+      extraGroups = [
+        "wheel"
+        "render"
+        "video"
+      ];
       initialPassword = "h";
     };
+  };
 }