remove shellhook, add nil to shell

templates/default/nix/devshells/default.nix

@@ -8,21 +8,12 @@ pkgs.mkShell {
   packages = [
     flake.formatter.${system}
     pkgs.jq
+    pkgs.nil
   ];
 
   # Add environment variables
   env = { };
 
   # Load custom bash code
-  shellHook =
-    # TODO(blocked/upstream): remove this once https://github.com/isbecker/treefmt-vscode/issues/3 is resolved
-    # (flake.inputs.nixago.lib.${system}.make {
-    #   data = flake.formatter.${system}.settings;
-    #   output = "treefmt.toml";
-    #   format = "toml";
-    # }).shellHook
-    # +
-    ''
-      echo $(git rev-parse --show-toplevel)
-    '';
+  shellHook = '''';
 }