Better promote easy pronunciation of IIIF as triple-eye-eff on website

[zimeon]

It is almost painful to hear people try to say eye-eye-eye-eff or miss an eye and say eye-eye-eff. In the specs we explain in the introductions that IIIF is pronounced triple-eye-eff. I think it would be helpful to add this to other key pages on the website like http://iiif.io/about/ and http://iiif.io/community/