fix: EDITOR, replace neofetch with fastfetch

modules/base.nix

@@ -19,7 +19,16 @@
   # https://github.com/NixOS/nixpkgs/blob/nixos-unstable/pkgs/tools/package-management/nix/default.nix#L284
   nix.package = pkgs.nixVersions.latest;
 
+  # for security reasons, do not load neovim's user config
+  # since EDITOR may be used to edit some critical files
+  environment.variables.EDITOR = "nvim --clean";
+
   environment.systemPackages = with pkgs; [
+    # core tools
+    fastfetch
+    neovim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
+    just # justfile
+    nushell # nushell
     git # used by nix flakes
     git-lfs # used by huggingface models