Make it easy to find documentation for GHC and installed packages
ghc-pkg builds a package database that helps GHC find all installed packages. But it'd be a great improment if the same step also helped the user find the Haddock documentation for all installed packages.
Corresponding to GHC's package database would be an HTML page that is a single point of entry for the user to find documentation about installed packages. Preferably together with a consolidated index. (And maybe
ghc --help should give the local URL of this documentation root.)