exai: iframe should not have auto height

https://github.com/montchr/exai/commit/2c3d2e042e71daa10e05b7c3f124152692696465
increase social icon font size globally. fixes #15
remove unneccessary border box sizing on social menu items
make comment button dark
sportsdesk sidebar
social links target="_blank" fixes #18
front page recent posts title links. fixes #19

color black, hover red