The content is in Daisy, and the Forrestbot on our zone retrieves it from there and generates the docs.
This process is then followed to get them on to c.a.o/2.1 http://wiki.apache.org/cocoon/CocoonWebsiteUpdate Take the quick route of unpacking the tar.gz and commit to the cocoon/site SVN. The top-level docs for c.a.o are also explained there. Sorry i cannot help more, going away. -David
