Getting started

PT story https://www.pivotaltracker.com/story/show/74918112

Adding static_page for Getting_started guide
Adding links to the guide to the landing page Let's Code, Navigation bar, Welcome email

why is this not included in the other navbar? It makes the navbar imbalanced:
![imbalanced](https://cloud.githubusercontent.com/assets/2663402/3591535/4ef0c832-0c65-11e4-814b-d297e16cb3f5.png)
and also breaks responsiveness:
![broken_responsiveness](https://cloud.githubusercontent.com/assets/2663402/3591538/57c12664-0c65-11e4-9287-1a4787c650cb.png)