Explicitly pass Bild.nix to nix builds & expose references to stable

This change was motivated by my testing of tabbyAPI. I kept doing like
`nix-build -A pkgs.tabbyAPI` and I thought, can't bild just do this? So I wrote
a file called TabbyAPI.nix with the following contents::

    { bild }: bild.pkgs.tabbyAPI

and it worked, I just needed this change to Bild.hs to supply the `bild`
argument. The benefit of using bild here is that I can get the logging,
concurrency settings, and linking to _/nix etc all by default. Plus, using a
standalone nix file like TabbyAPI.nix might be a good way to pin some package
in the build system and make sure it continues to build, test, and so on.

Also, thie means I don't sprinkle relative paths to the Bild.nix library
throughout the repo, which is bad practice anyway.

Re: explicitly exposing refernces to stable: This keeps things a bit more tidy
and less confusing when working on the nix library.

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