[Marketing] Do not open a new window for menu link on sugarlabs.org

[Simon Schampijer]

Hi,

can we change the behavior of opening a new window on sugarlabs.org please?

http://dev.sugarlabs.org/ticket/646

This is a pain for the Sugar users - our most valuable audience. This 
has been marked a blocker for the 0.84.2 release.

Thanks,
    Simon