Add haskell shortcuts

[Dmitrii Kovanikov]

I propose to add haskell shortcut to the following website:

• https://www.haskell.org/

So people can use [ghcup](@haskell) or [cabal](@haskell).

In addition, we can also add cabal shortcut to point to one of the following websites (not sure which one is better):

• https://www.haskell.org/cabal
• https://www.haskell.org/cabal/users-guide/