hugo: remove $bin/bin/generate

This is used internally for the build process is not meant to be used.

pkgs/applications/misc/hugo/default.nix

@@ -15,6 +15,10 @@ buildGoPackage rec {
 
   goDeps = ./deps.nix;
 
+  postInstall = ''
+    rm $bin/bin/generate
+  '';
+
   meta = with stdenv.lib; {
     description = "A fast and modern static website engine.";
     homepage = https://gohugo.io;