more progress on custom options config

modules/components/display-managers/ly.nix

@@ -1,9 +1,9 @@
 { inputs, self, ... }: {
-  flake.nixosModules.ly = { config, pkgs, ... }: {
-    services.displayManager.ly = {
-      enable = true;
-    };
+  flake.nixosModules.graphics = { config, pkgs, lib, ... }: {
+    config = lib.mkIf (config.components.displayManager == "ly") {
+      services.displayManager.ly.enable = true;
 
-    security.pam.services.login.fprintAuth = false;
+      security.pam.services.login.fprintAuth = false;
+    };
   };
 }