Hey guys. This worked perfectly!
Put this on Header.
Settings -> Advanced -> Code injection (Header)
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/scrollify/1.0.19/jquery.scrollify.min.js"></script><script> $(function() { $.scrollify({ section : ".Index-page", }); });</script>
In case you just want one index page to have the snap effect just put this on the INDEX page ADVANCED (header).