Old SoC page

The page at http://www.postgresql.org/developer/summerofcode still
referes to last year SoC.

I would suggest we remove it until such a point that we can add a page
for the new set of SoC. Or we update it for the new SoC ASAP. the way it
is now, people who go looking for SoC info may end up not noticing that
it's last years information. I know it says 2006, but that doesn't mean
people will read it :-)

//Magnus