separate gnome packages, add some desktop packages

nix/home/desktop.nix

@@ -5,18 +5,26 @@ let
     calibre
     dmenu
     firefox
-    gnomecast
     multilockscreen
+    obsidian
     signal-desktop
+    spotify
     slack
     vlc
     zathura
+    zoom-us
+  ];
+
+  gnomePkgs = with pkgs; [
+    gnomecast
+    gnome.gnome-tweaks
+    gnomeExtensions.worksets
   ];
 in
 {
   imports = [(import ./commandline.nix)] ++ [(import ./programs/rofi)];
 
   home = {
-    packages = defaultPkgs;
+    packages = defaultPkgs ++ gnomePkgs;
   };
 }