www: switch to relative URLs to the server root.

This fixes cases like 404.html being called if docs/foo.html didn't exist.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk@25930 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac
Sync every four hours.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk@25931 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac