[Docs] Update contributing pages for the docs repo

[pallasathena92]

What this PR does

Rewrites the parts of three contributing pages that still describe the docs as a website/ directory inside ome-projects/ome:

• Writing docs. Pages, nav.ts, redirects.json and images are named by their paths in this repository. The preview and the site's checks run from its root. The YAML check, the drift report and the pre-commit hooks get the commands that work with OME checked out next to it. The page now explains the pin in ome.ref, how a docs pull request differs from one in OME, and how the API reference is regenerated.
• Set up a development environment. "Check a docs change" and "Change the API" point to this repository instead of cd website and the make docs-examples and make generate-apiref targets.
• Pull requests and OEPs. The steps send docs changes to this repository, and the Website row leaves the table of OME's checks.

Why we need it

The site moved here in ome-projects/ome#1192, and the Website workflow and the nightly docs automation left OME with it. The commands on these pages no longer work: make docs-examples and make docs-drift in OME default to paths under website/, and make generate-apiref writes only the Hugo copy.

How to test

• pnpm test passes, which covers the links and anchors between the three pages.
• I ran the drift report with the command on the page, from this repository with OME next to it. The YAML check's command is the one in CONTRIBUTING.md.
• "The API reference" describes hack/genref/generate.sh, which [CI/Tests] Keep the API reference generator here #18 adds, so merge this after [CI/Tests] Keep the API reference generator here #18.

Checklist

• Every commit is signed off (git commit -s)
• pnpm lint && pnpm check && pnpm test && pnpm build passes locally

Summary by CodeRabbit

• Documentation
  • Updated contribution guides to explain that documentation is maintained separately, with revised setup, authoring, preview, and review instructions.
  • Clarified which checks apply to code changes and which run in the documentation repository, including site checks and YAML validation against the pinned OME CRDs.
  • Updated API-reference guidance to describe generation from the pinned OME version and explain that API changes may require updates to affected YAML examples.
  • Removed Node.js and pnpm from the prerequisites for setting up OME itself.

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• src/lib/content/contributing/development-setup.md

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📝 Walkthrough

Walkthrough

The contribution guides now direct documentation work to the separate ome-docs repository. They update its authoring paths, checks, OME pin workflow, and API-reference generation instructions.

Changes

Documentation repository workflow

Layer / File(s)	Summary
Documentation contribution paths src/lib/content/contributing/development-setup.md, src/lib/content/contributing/pull-requests-and-oeps.md, src/lib/content/contributing/writing-docs.md	The guides direct documentation changes to ome-docs and update page, preview, redirect, image, and repository-link paths.
Documentation checks and OME pin src/lib/content/contributing/development-setup.md, src/lib/content/contributing/pull-requests-and-oeps.md, src/lib/content/contributing/writing-docs.md	The guides describe site, YAML, drift, and pre-commit checks, plus the pull request workflows and OME revision pinned in ome.ref.
API-reference generation src/lib/content/contributing/development-setup.md, src/lib/content/contributing/writing-docs.md	The guides describe generating the API reference from the pinned OME checkout and checking generated output in the Website workflow.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to fd732

This change only updates contributor documentation to point to the ome-docs repository. It does not alter runtime behavior. Merge PR #18 first so the API reference instructions match the repository.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: updating contributing pages to reflect the separate documentation repository.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
Review comments at @src/lib/content/contributing/writing-docs.md:
- Line 607: Update the instructions containing `hack/genref/generate.sh ../ome`
so the referenced generator script is available in the target branch: include
`hack/genref/generate.sh` in this PR or ensure the change adding it is merged
first.

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📒 Files selected for processing (3)

• src/lib/content/contributing/development-setup.md
• src/lib/content/contributing/pull-requests-and-oeps.md
• src/lib/content/contributing/writing-docs.md

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