Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  a74ff522151a1ea5a04bbe687c0fb5d9a750885a

Hygiene: Remove templates for flow_topic_navigation

It just serves to confuse people reading your code. This template doesn't
render anywhere and is full of @todo notes.

It's very bad practice having unused code lying around the place.

Change-Id: I794a921fee616c5589440737b7f1682dce8e1329