add terms and privacy to the settings page

![screenshot 2014-10-09 15 26 32](https://cloud.githubusercontent.com/assets/74699/4585253/5cb14802-5003-11e4-8a5a-9657649d4ed6.png)
![screenshot 2014-10-09 15 26 22](https://cloud.githubusercontent.com/assets/74699/4585255/5f6c04b0-5003-11e4-8ee6-69677f8a441c.png)

we already have a `hide-on-mobile` class. no reason we can't do the same for desktop.