Reworked site design.

Important changes:
* moved .container to individual pages (not the index page), because wrapping jumbotron/subhead in it makes it look like http://i.imgur.com/ummyT5q.png or even like http://i.imgur.com/SyT4ahC.png
* pages must use subhead or at least provide some padding from top if not, or text will be stuck behind the navbar

Some screenshots:
![](http://i.imgur.com/nUtl8S7.png)
![](http://i.imgur.com/xub9tuD.png)
![](http://i.imgur.com/0yPL31z.png)
![](http://i.imgur.com/Wjgdr9R.png)
![](http://i.imgur.com/jTMwGbp.png)
![](http://i.imgur.com/73PR6Or.jpg)
![](http://i.imgur.com/3CdjlOe.jpg)