fix: correctly export bluesky package

default.nix

···
   modules = import ./modules; # NixOS modules
   overlays = import ./overlays; # nixpkgs overlays
 
-}
+  bluesky = pkgs.callPackage ./pkgs/bluesky { };
+}

flake.nix

···
       in
       {
         packages = nurPackages // {
+          default = nurPackages.bluesky;
           search = search.packages.${system}.default;
         };
         legacyPackages = nurPackages;
···
         };
       }
     );
-}
+}