Mark all pages for a deprecated package as deprecated

When a package is deprecated, it should not be necessary to go to the 'contents' section to see that it is deprecated.

The warning should be at the top of every page.

Here is an example: the following link is the first result for the query 'cprg hackage' on google. The package is deprecated.

http://hackage.haskell.org/package/crypto-random-api-0.2.0/docs/Crypto-Random-API.html

But that is nowhere to be seen, only on the main page:

http://hackage.haskell.org/package/crypto-random-api-0.2.0

See also haskell/haddock#328