How should I call to the suggested overlay?

First of all: thanks for the great library.

I'm puzzled by something (which may just stem from me not knowing enough Nix).

Theres's this [suggestedOverlay.nix](https://github.com/cdepillabout/stacklock2nix/blob/main/nix/build-support/stacklock2nix/suggestedOverlay.nix) file which you maintain. But it doesn't look like it's exposed by the Flake, is it? So I'm wondering, what is the recommended way to use this overlay from a flake? I could just vendor the file, but it feels unsatisfactory. Is there a better way?

Whatever the solution end up being, I recommend adding a comment to that effect to the README (I will happily volunteer a PR when I understand the issue).