feat: add caffeine gnome extension

modules/home/desktop/gnome.nix

@@ -70,6 +70,7 @@ in
         mpris-label
         pip-on-top
         rounded-window-corners-reborn
+        caffeine
       ]);
 
     # Set up gnome terminal as changing the default terminal is a pain

profiles/home/gnome.nix

@@ -67,6 +67,7 @@ in
           "rounded-window-corners@fxgn"
           "media-progress@krypion17"
           "mprisLabel@moon-0xff.github.com"
+          "caffeube@patapon.info"
         ];
         last-selected-power-profile = "power-saver";
       };