Edit Quiz: Yet more tweaks to prevent jumpiness during question reordering

This one addresses the case where the quiz was slow to load, resulting in the min-height getting set too early. Now, we add a call to updateFormHeight() after a 1200ms delay after finishing loading the quiz.

Also, when closing the settings panel, we should allow the form to shrink.
Temporarily remove node_modules from gitignore to fix an issue deploying to heroku