This way it will be easier to change the behavior of all table actions,
like adding ARIA attributes. In the past, when we changed the behavior
of the `link_to` method, we had to change all table action classes.
Note the CSS could probably be improved to avoid duplication with other
button style definitions. However, that's fine because we're going to
change the style of the links soon.
For the same reason, I haven't bothered to style every single link the
way it was until now.
We can find the booth through the booth assignment, so we don't need to
pass it in the URL.
Since the parameter is in the URL and not sent through a form, we can
also use `params[:poll_id]` directly, and so we can reuse the
`load_poll` method.
