Summary:
Removes the legacy `react-animated` package configuration and collapses the `Animated/src/` directory into `Animated/`.
Also, reconfigures all references to `Animated/src/` to just be `Animated/`.
Changelog:
[Internal]
Reviewed By: cpojer
Differential Revision: D22450848
fbshipit-source-id: 9fd4861e9f357d817d82e9fec71967a2936a3830
Tim Yung