flake: rework modules folder structure

modules/nixos/services/pipewire.nix

@@ -0,0 +1,20 @@
+{ config, lib, ... }:
+{
+  options.settings.services.audio = {
+    enable = lib.mkEnableOption "enable sound through pipewire and its compat layers";
+  };
+
+  config = lib.mkIf config.settings.services.audio.enable {
+
+    #enable RealtimeKit for realtime audio ( req by PulseAudio )
+    security.rtkit.enable = true;
+
+    services.pipewire = {
+      enable = true;
+      alsa.enable = true;
+      alsa.support32Bit = true;
+      pulse.enable = true;
+      jack.enable = true;
+    };
+  };
+}