[website] fix build by updating to jquery 3.0.0-rc1
[website] fix build by updating to jquery 3.0.0-rc1

Summary:
we were using jquery.min.js from the jquery-2.2.3 distribution, except that the `.min` files were actually 3.0 betas that were incorrectly packaged into 2.x.

that bug was fixed in jquery-2.2.4, so I'm just upgrading to 3.0 since it's been working fine for us accidentally.

Reviewed By: tomocchino

Differential Revision: D3335474

fbshipit-source-id: 6c0cc793c131f1f691c33a8561ab456c87df943f

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