Restyle the Lecturers' main poll View

All these relate to the view that displays a list of polls
AC:
-  Only two buttons are displayed:  "Edit" and "Start/View"
    - "Edit" button of a task is secondary Button
    - If a poll is inactive the "Start/View" button displays "Start"
        - When clicked the button starts the poll, and redirects to the poll
    - If a poll is active the "Start/View" button displays "Results"
