Adding fixes to football wallchart

## R2 Embed
*  Link to group pages.
*  Link to knockout page - still 404ing as the article isn't published.

## NGW
*  Link to group pages.
*  "Fixtures and results" heading don't link.

![world cup 2014 wallchart football the guardian](https://cloud.githubusercontent.com/assets/31692/3056948/8e30bbc0-e1d0-11e3-91ce-9c3b98d57643.png)


P.S. A little mission critical, need to try and launch before lunch tomorrow.