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

[Simon Schampijer]

Sean DALY wrote:
> I agree, as soon as we can decide on a common navbar across our
> separate site sections so visitors won't get lost. As stated
> previously I feel a two-tier navbar will work. Christian has promised
> to work something up.

Why can't we change the behavior now? People can *not* download 
activities when they used the link on the sugarlabs page (when using our 
browser). This is more serious to me then people possibly getting lost 
in a page.

Regards,
    Simon