Add new Geeks page based on Dana + Cyd’s design.

Implement [Geeks content page sketch](https://docs.google.com/a/codeforamerica.org/drawings/d/1M-HtCzcVPCKpg10tetWGRN0HwiQU-bd-uOAHYlcx78U/edit) and make it ready for public launch.

* [x] Set up Wordpress template for the Geeks page.
* [ ] Map content from GDocs version to template.