Revert "Update index.html"

This reverts commit 42f187271846e05600831db05c6090600f1cad39.
Revert "Update index.html"

This reverts commit 0532241bcc610a023cfba89f8593a8d23f834a19.
Revert "Delete preview.png"

This reverts commit da18a62bff1e345a615df5d916cb45f92c6ca3df.
Revert "Delete video.mov"

This reverts commit 5f6e1eaf60ca7dab94b575a64577735b27814299.