You can add the following to the .htaccess of the domain you want Zope3 to reside behind.
RewriteRule ^(.*) \
It is almost literally a copy of example 17.3.2 from Philipp von Weitershausen’s book. The only 2 differences are the RewriteBase line and the fact that it’s in a .htaccess and not in apache2-rewrite.conf.
PS – I’m still wondering when the demo section will go live.