Add task kensho link to home page

Ok, Done ! I also did fix some style on mobile.
This is new front page look on desktop 
![search the cpan - metacpan org-desktop](https://cloud.githubusercontent.com/assets/1759054/3230295/69879ff2-f0a1-11e3-870c-8c27ddd91e70.png)

This is on mobile 
![screenshot_2014-06-10-20-11-06](https://cloud.githubusercontent.com/assets/1759054/3230309/8b4ab3e0-f0a1-11e3-929c-df9c9f8e0bcc.png)