[polly][www] Remove unused VideoJS

These were added in 2011 in 54da06ca286dc47ae65ba87be439a8c20c685454 and 0d90112195609a85fa96e956ee8b48600d81c13c.

It was then incompletely removed in 2015 in c268835eca8f59b164caa50bdecb7b58415861af: the video itself was removed, but the VideoJS css & script is still loaded.

GitOrigin-RevId: 06055d98f061f0e1aaf14a396a97d17e6f80a931
5 files changed