nixos/goldwarden,goldwarden: drop

The software is abandoned upstream and does not work with new Bitwarden
server versions.

nixos/modules/module-list.nix

@@ -228,7 +228,6 @@
   ./programs/gnome-disks.nix
   ./programs/gnome-terminal.nix
   ./programs/gnupg.nix
-  ./programs/goldwarden.nix
   ./programs/gpaste.nix
   ./programs/gphoto2.nix
   ./programs/gpu-screen-recorder.nix