feat: Flake | revamp entire flake (#1)

Reviewed-on: #1

hosts/common/optional/services/audio.nix

@@ -0,0 +1,23 @@
+{
+  pkgs,
+  ...
+}:
+
+{
+  services = {
+    # Enable sound with pipewire.
+    pulseaudio.enable = false;
+    pipewire = {
+      enable = true;
+      alsa.enable = true;
+      alsa.support32Bit = true;
+      pulse.enable = true;
+      wireplumber.enable = true;
+    };
+  };
+  security.rtkit.enable = true;
+
+  environment.systemPackages = builtins.attrValues {
+    inherit (pkgs) pavucontrol;
+  };
+}