IMO it's not great that we're propagating "0.0" version-string-URLs, apparently in some way that Google happily picks up on. Is there a prominent link to a /0.0/ URL somewhere in the postgresql.org space, or are we redirecting some pages to a version 0.0?
Wow, I wonder how they got to that one. We certainly *shouldn't* be linking to that anywhere, but 0.0 is the internal one that's used for "devel" docs. But they should always be accessed as /devel/.
I've pushed a fix that gives a 404 on /0.0/. If there is actually a link pointing there, someone will tell us soon :)