Replace some links to old Wiki pages that redirect to docs.fp.o with
the redirect targets.
Wiki link to _Forbidden Items_ page is completely removed. That Wiki
page does not have a redirect, just a notice that the page is obsolete
and a link to the new legal docs. Since the new legal docs do not have
a corresponding page, the Forbidden Items page is really old, and there
does not seem to be anything there that could not be derived from the
general rules, the page really seems obsolete without replacement, thus
any reference to it can be removed.
This documents the policy adopted in
https://pagure.io/fesco/issue/2624.
I added the part about releng, because it is useful as a hint what to
do in case of problems. I didn't add the part about FESCo, because
FESCo serves as the general "escalation path" for various issues and I
don't think we need to mention this specifically here.
Package Maintainer Docs have moved
from wiki to docs.fedoraproject.org.
Update links to point to the new location.
Packaging Guidelines have been on docs.fp.o
for a long time already.
Update links to them, too.
