Merge flake.nix with clc-stackage #18
Description
I realised that there is an earlier attempt to nixify build environment for Haskell packages at https://github.com/haskell/clc-stackage/blob/master/flake.nix. This one is sufficient to build (and presumably generate haddocks for) ~90% of Stackage. It would be nice to converge somehow. At least, as a low-hanging fruit, I'd suggest to add all deps from clc-stackage flake to hackage-doc-builder-config.
CC @tbidne