add note about organisations

[tavareshugo]

I've come across a couple of people wanting to set up an organisation account for their research lab, and they had some confusion about how this should be done.

The confusion seemed to be that an organisation account isn't a "real account" (i.e. it doesn't have its own user, you can't login to an organisation account). Instead, organisation accounts have "owners", "managers", etc., so if you want to manage that account, you login to your own personal account and then manage it from there (if you're the owner, of course).
Organisation accounts can also be transferred ownership, and managers can be changed, which means they don't depend on a single user - that is why they are convenient for something like a research group or core facility, for example.

Perhaps worth it having a short note or slide on this topic.