Finish modularising config

There are still some things I want to change, but at least there aren't two systems now.

modules/sound.nix

@@ -0,0 +1,29 @@
+{ config, lib, pkgs, ... }:
+
+{
+  options.chvp.sound.enable = lib.mkOption {
+    default = false;
+    example = true;
+  };
+
+  config = lib.mkIf config.chvp.sound.enable {
+    chvp.zfs.homeLinks = [
+      { path = ".config/pipewire"; type = "cache"; }
+    ];
+
+    home-manager.users.charlotte = { ... }: {
+      home.packages = with pkgs; [
+        pavucontrol
+        qjackctl
+      ];
+    };
+
+    sound.enable = true;
+    services.pipewire = {
+      enable = true;
+      alsa.enable = true;
+      jack.enable = true;
+      pulse.enable = true;
+    };
+  };
+}