move devtools to devshell

configuration.nix

@@ -83,9 +83,6 @@
 
   # Enable touchpad support (enabled default in most desktopManager).
   services.libinput.enable = true;
-  hardware.opentabletdriver = {
-    enable = false;
-  };
   programs.xppen = {
     enable = true;
     package = pkgs.xppen_4.overrideAttrs (old: {
@@ -151,18 +148,14 @@
       "wheel"
     ];
   };
-
+  programs.direnv.enable = true;
   # Allow unfree packages
   nixpkgs.config.allowUnfree = true;
 
   environment.systemPackages = with pkgs; [
     git
-    clang-tools
-    gcc
-    cargo
     gnomeExtensions.user-themes
     gnomeExtensions.blur-my-shell
-    digital
   ];
   environment.gnome.excludePackages = with pkgs; [
     cheese # photo booth