Refactor back to a more modular configuration

modules/nixos/desktop/fonts.nix

@@ -0,0 +1,30 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.nixosModules.desktop.fonts;
+in
+{
+  options.nixosModules.desktop.fonts.enable = mkEnableOption "Enable fonts";
+
+  config = mkIf cfg.enable {
+    fonts = {
+      fontconfig = {
+        enable = true;
+      };
+
+      packages = with pkgs; [
+        nerd-fonts.jetbrains-mono
+        nerd-fonts.meslo-lg
+        terminus_font
+        terminus_font_ttf
+      ];
+    };
+  };
+}