Credit article authors #543

Observations
It's not evident for readers – and tedious to figure out – who wrote a particular article (and similarly, who maintains it).

Problem
Authors are not credited appropriately. This is a particular problem now that nix.dev is transferred to the NixOS Foundation, while @domenkozar provided the bulk of the original material. We also expect many more tutorial and guide authors to make new contributions, and those should be credited as well.

Approaches

• provide links to GitHub's blame view or contributors listing
  • the most accurate, requires least amount of maintenance once set up
  • probably more tricky to set up, may require custom code
• use Sphinx's codeauthor directive in documents
  • allows for more control, can highlight the original author(s) of a document (who usually account for the largest part of its contents over its lifetime)
• use CODEOWNERS to help communicating with maintainers
  • this is more interesting for the contribution and review process than for assigning credit

Priorities

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