Disconnects a member.
A disconnected member can't log in to members-only pages, and the member isn't visible in the dashboard.
Note: This action is irreversible. To connect the same member again, you have to create a member with a new slug.
You can only call this method when authenticated as a Wix app or Wix user identity.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.