Update fonts from the mathjax fonts Docker

Summary:
This incorporates the changes to add a KA copyright, and to generate the woffs
from the ttfs, not the otfs.

Test Plan:
 - Run huxley tests, see very little has changed (it looks like all the images
   shifted back down ~1/2 pixel, the opposite of what happened in ad97dab19c0
   when we started making our own woffs, which means we probably are now
   generating woffs the same way fontsquirrel does)

Reviewers: alpert

Reviewed By: alpert

Differential Revision: http://phabricator.khanacademy.org/D12889