Revert old change that separated ORG_EMAIL
It was based on the idea that ORG_STAFF_EMAIL would be from staff, while some places would use ORG_TECH_EMAIL if there were technical issues. ORG_TECH_EMAIL was never used, and it was causing issues as ORG_EMAIL started popping up other places.
Issue ots/clients/ardc/hypha-tracker#327: Update ARDC's contact address in outgoing email