Remove sound config as its no longer used.

install.sh

@@ -17,4 +17,4 @@ fi
 
 # Install NixOS.
 # shellcheck disable=SC2068
-nix --extra-experimental-features 'nix-command flakes' run 'github:nix-community/disko#disko-install' -- --impure --flake "path:$nixosDir/#$host" $@
+nix --extra-experimental-features 'nix-command flakes' run 'github:nix-community/disko#disko-install' -- --flake "path:$nixosDir/#$host" $@

modules/nixos/desktop.nix

@@ -25,7 +25,6 @@
   services.printing.enable = true;
 
   # Enable sound with pipewire.
-  sound.enable = true;
   hardware.pulseaudio.enable = false;
   security.rtkit.enable = true;
   services.pipewire = {