docs(archivebox): sync template standards

[mberlofa]

Summary

• register archivebox in the site sync playground registry
• keep the playground/site sync gate aligned with the chart validation PR

Validation

• make site-sync-check CHART=archivebox
• npm run lint
• npm run format:check
• npm run build
• make release-check REPO=site
• make attribution-check REPO=site

Chart PR: helmforgedev/charts#646
Issue: helmforgedev/charts#633

Summary by CodeRabbit

• New Features
  • Added support for the archivebox chart in the playground, enabling it to be synced and used with the other available chart options.

[coderabbitai]

📝 Walkthrough

Walkthrough

src/pages/playground.astro adds archivebox to the siteSyncPlaygroundConfigs map, expanding the set of playground chart slugs linked to src/data/playground-configs.ts.

Changes

Playground Config Update

Layer / File(s)	Summary
Add archivebox entry to siteSyncPlaygroundConfigs src/pages/playground.astro	Added an archivebox mapping to src/data/playground-configs.ts in the playground sync configuration.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• helmforgedev/site#322: Also extends src/pages/playground.astro by adding a new chart slug to siteSyncPlaygroundConfigs.
• helmforgedev/site#330: Also updates the same playground sync mapping to register additional chart slugs.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Title check	✅ Passed	The title is related to the change, but it is broader and less specific than the actual registry update.
Description check	✅ Passed	The description covers the summary and validation steps, and includes the related issue, so it is mostly complete.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/archivebox-template-standards-sync

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