removed retail qr code added retail fallback

@donnapep @stulees @swbloom @pcsandford 

Here are a series of small changes I made to my repo, please review.

-Removed Retail qrcode template (gave it its own repo)
-Added fallback image for video for retail template
-Enabled GPU in Events Template
-Replaced Jquery with Css in School Calendar template

Thanks,
Mat