Add ability to select, save, and load lessons #63
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This PR adds a checkbox to select lessons for later emailing. One selected, it stores the lesson's id in a session variable so that selections persist across pages. The
lessons/saved_lessons
route will show all saved lessons, while thelessons/load_lesson
route will allow people to restore saved lessons from a link, paving the way to include "resume session" links in the emails.The email backend is not implemented because it's dependent on #60. The email frontend is not implemented because I'm the worst at front end.