Remember me feature in UI when using password

[KiraLT]

At the moment login password is stored in the browser memory. So after each reloads you need to enter the password.

We can add the "Remember me" checkbox to the UI login page. We probably also need a logout button.

[KiraLT]

We can use something like express-session, but it requires some kind of database. If we wish to have stateless sessions, we can use JWT. So express-session-jwt may work, or we can just create simple JWT implementation ourselves- because we have only one user with one password, it won't be hard.