Incognito mode

[thisisartman]

Is your feature request related to a problem? Please describe.
There's no way to browse privately. Sometimes, it's easier to not have the ability to upvote or comment, but having to log out for this every time is cumbersome.

Describe the solution you'd like
An additional option in the accounts list for anonymous/incognito mode.

Describe alternatives you've considered
The closest alternative to this is to log out of all accounts and then scroll. Obviously, this requires extra steps that a button would solve.

Additional context

[micahmo]

Related to #269.