BBDB repositories at GNU Elpa and NonGNU Savannah (bug#71924)

For quite many years development of BBDB has happened at NonGNU
Savannah.  More recently, but likewise for quite some years, BBDB has
also been available via GNU Elpa.  Having two repositories for BBDB
requires not only more work, but it can also cause confusion, see

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=71924

Is the BBDB repository at NonGNU Savannah still needed?  If this
repository can it be put to rest while development continues at GNU
Elpa, this will make life easier for me.  (Nothing at Savannah needs to
be deleted for this.  The git repository documents the history of BBDB
since the early days of BBDB.)

Other packages like AUCTeX have already moved completely to GNU Elpa.