Update app-optimization.liquid

[NebularNerd]

Closes #9

Adds extra listeners to allow for non-scrolling pages. mousemove and touchstart do pretty much what they say. This helps block elements until you are ready for them to appear. One change from my original issue is the combined event.type remove. This cleanly removes the listeners all at once, otherwise you get three removal triggers which could cause scripts to try and load more than once.