Support for guest mode

[Gozala]

Is your feature request related to a problem? Please describe.

This is really cool! I would really like if it had a 1st class support for semi-trusted devices. For example I need to login to a website from a friends device, ideally I would be able to do so without leaving my master key there. It is somewhat possible using private mode (as it would free storage once window is closed) however user flow is sub-optimal in such instance.

Describe the solution you'd like
Would be nice to have https://derivepass.com/guest or something along the lines (even better if private mode is detected and https://derivepass.com/ just forwards there where you can just type password, domain, username, rev and compute password right away.

Describe alternatives you've considered
Any other way that would cut down number of steps one needs to take to compute password on temp device.