When using a search engine for WiredTiger docs, it's really easy to wind up on a page for an ancient version.

There's a couple of possible approaches here:

• link rel="canonical", as documented at https://en.wikipedia.org/wiki/Canonical_link_element
• robots.txt to discourage search engines from looking at the old one at all

Whatever change gets made, it'll probably take months to get reflected in search engine indices. So we probably also want a follow-up ticket to check the results.