[myurl] Set the correct attributes for icons to be recognized by ios
[myurl] Set the correct attributes for icons to be recognized by ios

Summary:
Set the correct attributes for icons to be recognized by ios. It works for
android before but the new attributes should be more up-to-date. I got it from
http://stackoverflow.com/questions/27612244/minimum-viable-favicon-code

Test Plan:
Test with "Add to Home Screen" in iOS.

hermantai/beta-programs,hermantai/beta-programs,hermantai/beta-programs