Better publishing of our project Haddocks

[michaelpj]

At the moment there's a manually generated dump of some of the Haddock on our GH pages, but this is very ad hoc.

It would be better to generate a nice, combined Haddock bundle for all of our packages, and do so on the CI so we can always be pointing to an automatically generated, up to date version.

However, this is a bit annoying, since the Haddocks generated with Nix have links pointing at dependent packages in the store, so it'll be hard to stitch them together so the links point at each other instead.

cabal new-haddock seems promising for this, but I was unable to get it to work:

• It requires cabal new-build to work for starters
• It requires network access (offline mode is broken)

Might be able to do this ourselves with a bit of creativity.

[michaelpj]

This is a lot better, I'm closing it as done for now.