Haddock now lives full-time in the GHC repository

[Hécate]

Hello devs,

As of today, Haddock now lives in the GHC repository, and not anymore as 
a submodule from another Gitlab repository which itself was rebased on 
top of a Github repository.

You are encouraged to migrate our currently opened PRs to the GHC repo. 
If you have any trouble, please do ping me on Matrix 
(@acidalia:matrix.org), on GitLab (@kleidukos), or by email directly.

Read more here: 
https://discourse.haskell.org/t/haddock-now-lives-in-the-ghc-repository/9576

My thanks to Ben Gamari who was essential in making this migration happen!

Cheers,

Hécate

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