Is your feature request related to a problem? Please describe.
There's no way to log out from the island web interface.

The incentive to logout is pretty low in most cases, but with the recent changes to authentication, it should also be pretty easy to implement.

Describe alternatives you've considered
It would make sense to allow users to logout, otherwise, we should also remove the timeout for the session if we deem that logging out is irrelevant.

Tasks

• Add a logout button. BTW we can't lock the repository encryptor on logout! (0.5d) - @VakarisZ