[Webteam] Updated links to bugs.impara.de on www.squeak.org

[Matthew Fulmer]

I fixed all the links on www.squeak.org that had pointed to
bugs.impara.de; they now point to bugs.squeak.org.

There weren't as many as I expected, just the one in the "Links"
sidebar, and the ones in
http://www.squeak.org/Releases/Squeak3.9/

-- 
Matthew Fulmer -- http://mtfulmer.wordpress.com/
Help improve Squeak Documentation: http://wiki.squeak.org/squeak/808