Open Sign in/Sign up page if the user tries to vote while not logged in

[lkuessner]

Right now there is just a small toast notification that doesn't really gets the attention it deserves.

We could do something like:

If (userNotLoggedIn & clicks on vote button) showModal else proccessWithVote;

Example of a modal: https://mui.com/material-ui/react-modal/

[Eko450-eng]

Implemented in next version