Use submodules

Author: stackptr

flake.nix

@@ -35,7 +35,7 @@
       inputs.systems.follows = "systems";
     };
     zx-dev = {
-      url = "github:stackptr/zx.dev";
+      url = "github:stackptr/zx.dev?submodules=1";
       inputs.nixpkgs.follows = "nixpkgs";
     };