Add Scrollbars to Queue Page

[dfarooq610]

There is a slight inconvenience of the queue page design -- people need to the page down a lot to view the contents of the queue.

Rather, we should add scrollbars to the list portion of the queue and fix the height to the viewport size, so that people can scroll through the queue without scrolling the overall page. This is instead of "waiting in line" questions rendering downward, extending the page to infinity

Screen.Recording.2022-05-20.at.12.15.55.AM.mov