replace xfce with gnome

.gitignore

@@ -0,0 +1 @@
+hardware-configuration.nix

configuration.nix

@@ -42,11 +42,8 @@
   # Enable the X11 windowing system.
   services.xserver = {
     enable = true;
-    desktopManager = {
-      xterm.enable = false;
-      xfce.enable = true;
-    };
-    displayManager.defaultSession = "xfce";
+    displayManager.gdm.enable = true;
+    desktopManager.gnome.enable = true;
   };
 
   
@@ -71,14 +68,13 @@
     extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
     packages = with pkgs; [
       firefox
-      nicotine-plus
     ];
   };
 
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [
-    vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
+    vim
     wget
     curl
     git