feat: make nixos-laptop empheral

modules/programs/hyprland/default.nix

@@ -198,30 +198,17 @@ in
         alsa.support32Bit = true;
         pulse.enable = true;
       };
-      greetd = {
+      xserver = {
         enable = true;
-        settings =
-          let
-            hyprlandCommand = getExe' hyprland "Hyprland";
-          in
-          {
-            initial_session = {
-              command = hyprlandCommand;
-              user = "moritz";
-            };
-            default_session = {
-              command = ''
-                ${pkgs.greetd.tuigreet}/bin/tuigreet \
-                  --time \
-                  --asterisks \
-                  --user-menu \
-                  --remember \
-                  --power-shutdown 'systemctl poweroff' \
-                  --power-reboot 'systemctl reboot' \
-                  --cmd ${hyprlandCommand}
-              '';
-            };
+        displayManager = {
+          lightdm.enable = true;
+          autoLogin = {
+            enable = true;
+            user = "moritz";
           };
+          defaultSession = "hyprland";
+          sessionPackages = [ hyprland ]; # can't set the defaultSession otherwise
+        };
       };
     };
     security.rtkit.enable = true;