Integration of https://signal.org/ chat

@Thomas_Rother Have reached out to the non-profit group that manages Signal about integration? I’m interested in the concept for the same reasons, and don’t want to duplicate effort if you’ve already contacted them. Having said that, I still need deeper research into the Discourse Encryption plugin, as well as the current state of the Discourse phone app, which always seemed like a complicated way of launching a link shortcut.