Notifications for RERUM Users

In particular, "Notifications From the Developers" and/or "Notifications From the Admins" -- a way for us to notify registered RERUM users/Agents about something. Perhaps for days when RERUM is down due to error maintenance, or anticipated updates and releases. It would be nice to be able to push out a message to give people lead time before down time. I think the list of Auth0 Users is a good user list to pull, and we could hand that list to whatever Notification system we set up.

Note Auth0 does not have a mechanism for sending E-mails to "all registered Users".