Add @Scale video to website
Add @Scale video to website

Summary: ![screen shot 2015-09-17 at 5 56 14 pm](https://cloud.githubusercontent.com/assets/55161/9949709/7460c9ee-5d65-11e5-858b-6de8b97128ad.png)

Closes https://github.com/facebook/relay/pull/336

Reviewed By: @​svcscm

Differential Revision: D2456114

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