GHC user manual

[Simon Peyton Jones]

Where is the latest GHC user manual.  I tried
               https://ghc.gitlab.haskell.org/ghc/doc/
but got a 502 failure.
It would be good if it was easy to find the link from the developers home page
https://gitlab.haskell.org/ghc/ghc/wikis/home
Simon
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