Update index.html.erb

Today I followed Railsgirl in Amsterdam, I am actually still sitting in Publitas and together with Sytse, I wanted to make and edit to the Dutch Raislgirls website. So I hope it will be merged :-)

You can see the changes on this screenshot on dropbox:
https://www.dropbox.com/s/968hlv9466nqwdw/Screenshot%202014-06-07%2017.19.22.png