[virtualbox] Move into proper module

nixos/modules-old/apps/default.nix

@@ -4,6 +4,5 @@
         ./kitty
         ./steam
         ./thunderbird
-        # ./virtualbox
     ];
 }

nixos/modules-old/apps/virtualbox/default.nix

@@ -1,17 +0,0 @@
-{
-
-    virtualisation.virtualbox = {
-        host = {
-            enable = true;
-            enableExtensionPack = true;
-        };
-        guest = {
-            enable = true;
-            x11 = true;
-        };
-    };
-    users.extraGroups.vboxusers.members = [
-        "user-with-access-to-virtualbox"
-    ];
-
-}