Courses now open full screen

Starting a course now opens it as a full-width, distraction-free page instead of a narrow column. Quizzes can also be delivered in more ways — one question at a time or all on one page, with shuffled questions and answers, a time limit, and a choice of when answers are revealed. Separately, the admin panel now has a search box at the top (Cmd+K or Ctrl+K) that searches every page and all content at once, and the sidebar remembers which sections you collapsed.