refactor config with better structure

nixos/hardware/audio.nix

@@ -0,0 +1,17 @@
+{ pkgs, ... }:
+
+{
+  security.rtkit.enable = true;
+
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+    jack.enable = false;
+  };
+
+  environment.systemPackages = with pkgs; [
+    alsa-scarlett-gui
+  ];
+}