(Internal) Gem domains

Customers sometimes request a full list of the domains required to use Gem, including the domains of any third party services that are running on the Gem site. The full list is here:

https://docs.google.com/spreadsheets/d/1ReE9bHOIASYP-tJ2pP84yTL_QNu9QfoWCxQ87RCPbok/edit#gid=1979220759