more nits.

flake.nix

@@ -11,12 +11,10 @@
     nixpkgs,
     flake-utils,
   }:
-    flake-utils.lib.eachDefaultSystem (system: let
-      pkgs = import nixpkgs {inherit system;};
-    in
-      with pkgs; {
+    flake-utils.lib.eachDefaultSystem (system:
+      with import nixpkgs {inherit system;}; {
         devShells.default = mkShell {
-          buildInputs = [hugo];
+          packages = [hugo];
         };
       });
 }