thanks for remembering this, we definitely need to manage the redirect, however: 

- the `redirect-path` field is "take this path and redirect requests for it somewhere else." while `url-base` is the "somewhere else". So this is basically backwards. No big deal, I have to look at the header each time and repeat the "`redirect-path` is from `url-base` is to" mantra in my head while writing these rules.

- `outputs` is the editions/versions of the manual where the redirect must exist. In the following regexp-ish statement, it's everything between the parens `http://docs.mongodb.org/(manual|master|v2.2|...)/.*` Think about the history of this page: the goal is to make sure that if we've published `redirect-path` for a given output, that we list it here. In this case I think we want `manual` and `master`.

   Redirects that don't include manual and master are typically for pages that we've added to the current release, and these redirects support the version flipper experience. 

   Incidentally there are also fake outputs for `before-<version>` and `after-<version>`. which make it possible to specify groups of outputs more easily, and while we don't use many of them right now because we have a limited number of versions, we will have more in the future.