Bug#971623: review and simplify the /devel/wnpp section

On Sat, Oct 3, 2020 at 9:45 AM Laura Arjona Reina wrote:

> Having a look at both the resulting listings that we provide in
> www.debian.org/devel/wnpp, and the ones provided in wnpp.debian.net, I
> think maybe we could review our old approach and remove most of the
> listings we were providing, and link to wnpp.debian.net instead.

wnpp.debian.net is an unofficial service that could go away at any
moment if the Debian member sponsoring the domain leaves Debian or the
contributor providing the service decides to shut it down. I think it
would be better to not rely on it for things that we don't need to
rely on it for and rely on it for things that aren't implemented
anywhere else.