Add citation information to articles

[mlbrgl]

Original issue by @maxroser

Core problem

Readers don't know how to cite articles.

Proposed solution

Derive citation information from the article parent topic. Requires articles and topics to be linked through parent <-> child relationships, deployed in #1070 and built upon in #1447

Context

• https://www.notion.so/owid/Sync-last-updated-date-with-citation-c6ce6a725c4445aeb2430a6a643a2c0f
• https://github.com/owid/owid-issues/issues/266

[mlbrgl]

Prioritized as important since citations are a clear marker of Our World in Data being a scientific publication, which contributes to our credibility.

[github-actions[bot]]

This issue has had no activity within 10 months. It is considered stale and will be closed in 7 days unless it is worked on or tagged as pinned.

[maxroser]

Good reminder by the GitHub bot! We also just discussed it yesterday and it'd be good to make progress on this one.

cc @mathisonian and @JoeHasell

[danyx23]

@JoeHasell should we close this issue? Should we update it to reflect our thinking?