Redirect Make WordPress Flow URLs to Make WordPress Test

[krogsgard]

I just realized make.wordpress.org/flow is now make.wordpress.org/test. The main URL redirects, but no others do.

Trying to find an old article I wrote revealed to me that the /flow/ site is gone, and it now 404s, instead of properly redirecting to ​https://make.wordpress.org/test/2015/02/26/core-support-for-wordpress-images-to-open-in-a-modal-window/

I tested that this is also the case for several other URL structures (like author URLs) and probably most others.

It'd be nice for a proper regex based redirect scheme to handle older content that's indexed with /flow/ instead of /test/.

[samuelsidler]

cc @dd32

[ocean90]

Closing as invalid since a fix is already there (Dion committed that 2 days ago), but w.org has currently a deployment issue on a few servers.