Update O3 public alerts page to point to published catalog
Here's a suggestion from Beverly Berger to add a pointer to GWTC-2 on the O3 public alerts page. -jonah
I had a thought about how to add information on the final resolution of alert triggers to https://gracedb.ligo.org/superevents/public/O3/. I think it would be sufficient to say something like see (relevant table of events in GWOSC) and (section in the catalog paper where the reasons for the final set of events are given).