add various programs

modules/services/nerdfonts.nix

@@ -0,0 +1,15 @@
+{
+  flake.modules.nixos.nerdfonts = { pkgs, ... }: {
+    fonts = {
+      enableDefaultPackages = true;
+      packages = with pkgs; [
+        nerd-fonts.jetbrains-mono
+      ];
+      fontDir.enable = true;
+    };
+  };
+
+  flake.modules.homeManager.nerdfonts = {
+    gtk.font.name = "JetBrainsMono";
+  };
+}