Should `/auth/me` be hidden in read-only mode?

[edan-bainglass]

Pinging @eimrek

I'm not so sure about this one. Will circle back when I address authentication more robustly.

[eimrek]

ATM it's only used for the POST endpoints, AFAIK. When we will deploy this to Materials Cloud in the read-only mode, i think it's confusing if our docs show an authentication endpoint.

However i see that in general it might make sense to also support having the read endpoints behind authentication, but it's not a high priority atm.