Instagram icon update

[guillaumeberry-zz]

We need to update this tiny little icon for our Instagram account and in profile links. It's probably just a Fontawesome or a Glyphicons update…

Official source for Instagram brand: https://www.instagram-brand.com/

Ping me if you need help 😉

[tonifisler]

👍 an update to the bower.json and it's done. We should refactor the styleguide...