Improve discussions with Flow

Right now, discussion either happen on IRC or on the article page itself. This might not scale well beyond a certain level of participants. [Flow](https://www.mediawiki.org/wiki/Extension:Flow) is an improvement to Talk pages and adds some structure to conversations.

Start by reviewing the existing discussion locations mentioned in the issue: IRC and the article page, then read the linked Flow extension documentation. The issue does not name repository files, tests, or a concrete implementation scope; done would require defining how Flow should improve discussions and what integration is intended.

Written by the indexing model from the issue text.