Allow facilitator to hand off facilitator role to another user

[drewhousman1010]

A user 🔒 writes:

I thought I could transfer the facilitator but couldn’t figure out how

Facilitator's sometimes want to give the role away, as opposed to asking someone else to take it.

Related to issue 5378

[gcrickman]

A user 🔒 writes:

How come I can’t change the facilitator on this newly created board?