Add "clear schedule" button
Summary
Currently the only way to remove courses from your schedule is to manually remove them one by one. This is really tedious. There should be a button on the schedule page that removes all courses from the user's cart.
Helpful Links
All handling of the cart is done in sessions_controller.rb. You will have create a new endpoint and in that endpoint, set the cookie to be an empty list. Then redirect back to the schedule page.
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