The Pro Git links to Amazon use Scott's personal affiliate
id, which puts Git the non-profit project in a murky area.
This site is not owned or managed by the Software Freedom
Conservancy's member project Git, but it's de facto status
as the official site makes things awkward. And anyway, it
would be nice to donate the affiliate revenue to the
This patch replaces all of the affiliated Pro Git links with
ones that mention the Git/SFC affiliate id.
The intent of this site is to be about Git, not GitHub, and
it mostly does a good job of not mentioning GitHub at all.
One exception is the community page, which lists Freenode IRC
channels for #git and #github. Let's be more neutral and
note that #git is the right place for git advice, and
provider-specific channels can be used for advice on those