boreal: switch to pipewire

hosts/boreal/default.nix

@@ -74,6 +74,8 @@ in
       ];
     };
 
+    pipewire.enable = true;
+
     wireguard = {
       enable = false;
       iface = "wg";
@@ -112,13 +114,6 @@ in
   # TODO: remove when https://nixpk.gs/pr-tracker.html?pr=124237 reaches unstable
   nix.sandboxPaths = [ "/bin/sh=${pkgs.bash}/bin/sh" ];
 
-  sound.enable = true;
-  hardware.pulseaudio = {
-    enable = true;
-    extraModules = [ pkgs.pulseaudio-modules-bt ];
-    package = pkgs.pulseaudioFull;
-  };
-
   hardware.bluetooth = {
     enable = true;
     powerOnBoot = true;