add(print): added print support

modules/nixos/default.nix

@@ -2,6 +2,7 @@
   imports = [
     ./apps-optional.nix
     ./backlight.nix
+    ./btop.nix
     ./boot.nix
     ./fonts.nix
     ./hardware.nix

modules/nixos/services.nix

@@ -24,11 +24,19 @@
     gnome.gnome-keyring.enable = true;
 
     # Complements printer support
-    printing.enable = true;
+    printing = {
+      enable = true;
+      drivers = with pkgs; [
+        gutenprint
+        cups-filters
+        hplip
+        cups-browsed
+      ];
+    };
     avahi = {
       enable = true;
       nssmdns4 = true;
-      openFirewall = false;
+      openFirewall = true;
     };
     pipewire = {
       enable = true;