Setup roles as modules and switch to sway

roles/printing/default.nix

@@ -1,4 +1,15 @@
-{ ... }:
+{ config, lib, ... }:
+
+with lib;
+
 {
-  services.printing.enable = true;
+  options.roles.printing = {
+    enable = mkEnableOption "Enable default printing setup";
+  };
+
+  config = {
+    services.printing.enable = true;
+
+    # TODO: Add actual printer setup config here...
+  };
 }