title: Reset jupyter notebook shortcuts to default
body: <p>I changed some shortcuts for my jupyter notebooks. Though, after all, I don't like my changes, anymore.</p>
  
  <p>Is there a way to reset all shortcuts at once? Under "Help" -> "Edit Keyboard Shortcuts", I don't see this option. I only could go over all keys manually and change them back... If I even knew which I have changed... </p>