add "/entity/" redirects for wikidata per

https://meta.wikimedia.org/wiki/Wikidata/Notes/URI_scheme
and talk with aude and dkinzler

and move all wikidata stuff into main.conf instead of having
it in 2 places

we have to use a real, external Redirect to the Special page,
so we chose to just always redirect to https

Bug: 44098

Change-Id: I0891bbf65997e1f672756a2a58e1c629e6bb077a
Merge "add "/entity/" redirects for wikidata per"