fix broken system w default.nix

.envrc

@@ -0,0 +1 @@
+use nix

nixos/default.nix

@@ -1 +1,5 @@
-{ }
+# This file does nothing but call configuration.nix
+# It is required when in a shell.nix environment
+{ ... }: {
+  imports = [ ./configuration.nix ];
+}

shell.nix

@@ -0,0 +1,5 @@
+# Environment with formatting tools for editing these files
+{ pkgs ? import <nixpkgs> { } }:
+pkgs.mkShell {
+  nativeBuildInputs = [ pkgs.buildPackages.stylua pkgs.buildPackages.nixfmt ];
+}