update plasma

modules/desktop/de/plasma.nix

@@ -17,7 +17,5 @@ in
       utterly-nord-plasma
       libsForQt5.qtstyleplugin-kvantum
     ];
-
-    qt.style.name = "kvantum";
   };
 }

modules/desktop/fonts/default.nix

@@ -0,0 +1,6 @@
+{ config, pkgs, ... }:
+{
+  environment.systemPackages = with pkgs; [
+    fira-code
+  ];
+}