BU explainer animation

[Derekf5]

Script (in progress): https://docs.google.com/document/d/1gRtQMqoBwOUOJe0MOTvdXUyxoS9Uckv5YeHnmwsnn-c/edit

[myleshorton]

Paused for now -- depends on the web site conversation and social media time commitments.