add new external flake to provide helper functions

modules/components/window-managers/niri.nix

@@ -38,9 +38,9 @@
       };
 
       home-manager.users.grey = lib.mkIf (config.features.nixos.home-manager.enable) ({ lib, config, ... }: {
-        home.activation.symlinkNiriConfig = lib.hm.dag.entryAfter ["writeBoundary"] (config.helpers.mkSymlinkActivationScript { 
-          target = ".config/niri/config.kdl";
-          source = "dotfiles/${config.info.hostName}/niri.kdl";
+        home.activation.symlinkNiriConfig = lib.hm.dag.entryAfter ["writeBoundary"] (inputs.helpers.mkSymlinkActivationScript { 
+          target = "${config.users.grey.homeDir}/.config/niri/config.kdl";
+          source = "${config.info.rootPath}/dotfiles/${config.info.hostName}/niri.kdl";
         });
       });
     };