use zs from nixpkgs

flake.nix

@@ -19,17 +19,14 @@
           inherit system;
         };
       in
-      with pkgs; let
-        zs = callPackage ./zs.nix { };
-      in
       {
-        formatter = nixpkgs-fmt;
-        devShells.default = mkShell {
+        formatter = pkgs.nixpkgs-fmt;
+        devShells.default = pkgs.mkShell {
           buildInputs = [
-            zs
+            pkgs.zs
           ];
         };
-        packages.default = callPackage ./default.nix { inherit zs; };
+        packages.default = pkgs.callPackage ./default.nix { };
       }
     );
 }

zs.nix

@@ -1,41 +0,0 @@
-{ lib, fetchFromGitea, buildGoModule, installShellFiles }:
-
-buildGoModule rec {
-  pname = "zs";
-  version = "0.4.1";
-
-  src = fetchFromGitea {
-    domain = "git.mills.io";
-    owner = "prologic";
-    repo = "zs";
-    rev = version;
-    hash = "sha256-V8+p19kvVh64yCreNVp4RVdkJkjrq8Q5VbjaJWekZHY=";
-  };
-
-  vendorHash = "sha256-KXcYTYO4wnWOup5uJ6T+XwthX5l2FL02JyOt1Nv51Sg=";
-
-  ldflags = [
-    "-w"
-    "-X=main.Version=${version}"
-    "-X=main.Commit=${src.rev}"
-    "-X=main.Build=1970-01-01T00:00:00+00:00"
-  ];
-
-  nativeBuildInputs = [ installShellFiles ];
-
-  postInstall = ''
-    installShellCompletion --cmd zs \
-      --bash <($out/bin/zs completion bash) \
-      --fish <($out/bin/zs completion fish) \
-      --zsh <($out/bin/zs completion zsh)
-  '';
-
-  meta = with lib; {
-    description = "An extremely minimal static site generator written in Go";
-    homepage = "https://git.mills.io/prologic/zs";
-    changelog = "https://git.mills.io/prologic/zs/releases/tag/${version}";
-    license = licenses.mit;
-    maintainers = with maintainers; [ adtya ];
-    mainProgram = "zs";
-  };
-}