The new logo was the winner of a recent round of voting among Release
Engineering. (See https://phabricator.wikimedia.org/V19) It incorporates
colors from the WM design palette and the ring pattern from the logos of
other WM teams, platforms, and tooling.

R.I.P. Tyler's dead-whale logo.

Change-Id: I0f79dcd9cb521f39059fa4270f65508c3c097a54