Add explicit support for DVD and BluRay

hardware/dvd/default.nix

@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+{
+  environment.systemPackages = with pkgs; [
+    libbluray
+    libdvdcss
+    libdvdnav
+    libdvdread
+  ];
+}

systems/gwyn/default.nix

@@ -6,6 +6,7 @@
     inputs.nixos-hardware.nixosModules.common-gpu-intel
     "${inputs.self}/hardware/bluetooth"
     "${inputs.self}/hardware/nvidia"
+    "${inputs.self}/hardware/dvd"
     "${inputs.self}/modules/data-share"
     "${inputs.self}/modules/desktop"
     "${inputs.self}/modules/docker"