Task: Document how to take ownership over a manual section

If you're interested in working on this task, reply in this issue to make sure the work isn't duplicated!

What

A section to describe what it means to take ownership over a manual section.

Key points:

• This is specifically for the Nix manual, Nixpkgs manual and NixOS manual
• Prerequisites is to have experience with the subject matter
• Include the general maintainer responsibilities section
• Determine the types of documentation contained in the section according to Diátaxis and move it accordingly:
  • The manual itself should only consist of reference documentation
  • Tutorials, Guides and Explanation documentation should be moved to nix.dev
  • Make sure to take into account redirects that should be put into place to avoid breaking URLs
    • To change Nix manual redirects see nixos-homepage/netlify.toml, for anchors redirects see nix/redirects.js
    • TODO: (@pennae) how are anchor-level redirects handled in the Nixpkgs and NixOS manuals?
• Determine the support status of the documentation and move it to the correct place:
  • Only projects under the NixOS GitHub organisation should be in the manual
  • If the docs are for a third-party project, make a PR with the docs to that project and link to the result
• Improve quality of existing reference documentaton
  • Are API listings complete?
  • Does every interface listing provide fully working, concise examples? (no placeholders)
  • All attributes and arguments should be fully documented including typing information, defaults and semantics
    • check if an (fragment) example is needed to demonstrate how it's used

How

• Where to put the result: A new section under https://nix.dev/contributing/ (source)
• Estimated effort: 2 hours
• Related:
  • https://discourse.nixos.org/t/documentation-team-call-for-maintainers/25970
  • https://github.com/NixOS/nix.dev/blob/master/maintainers/responsibilities.md
• Person to contact for help and review: @infinisil

Start with the contributing source directory in nix.dev and the maintainer responsibilities section linked in the issue. Review the Nix manual redirect files, nixos-homepage/netlify.toml and nix/redirects.js, then define the new ownership section with Diátaxis guidance, support-status rules, redirect handling, and reference-documentation quality checks; completion requires review from @infinisil.