Add volunteers to section organizer page

Add section organizer section widget to style guide
and style it a bit
Remember how the secret_token was in github? Guh.
[#49528619] completed waitlisted students should see edit/cancel rsvp button
Merge branch 'student_waitlist_index' of https://github.com/sowjumn/bridge_troll into sowjumn-student_waitlist_index
added class level pref for volunteers