docs(authelia): sync template standards

[mberlofa]

Summary

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

Validation

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

Chart PR: helmforgedev/charts#647
Issue: helmforgedev/charts#633

Summary by CodeRabbit

• New Features
  • Added support for an additional playground configuration, making more chart content available in the UI filters.
  • Updated chart selection behavior so the new option can appear in the playground when eligible.

[coderabbitai]

📝 Walkthrough

Walkthrough

A single authelia entry was added to siteSyncPlaygroundConfigs in src/pages/playground.astro, expanding the playground chart filter to include that chart slug.

Changes

Playground Config Update

Layer / File(s)	Summary
Add authelia playground config entry src/pages/playground.astro	Adds authelia to siteSyncPlaygroundConfigs, mapping it to src/data/playground-configs.ts and extending the chart slugs considered by the playground filter.

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

Possibly related PRs

• helmforgedev/site#322: Also adds a siteSyncPlaygroundConfigs entry in src/pages/playground.astro, affecting the same playground filtering path.
• helmforgedev/site#330: Also extends the siteSyncPlaygroundConfigs registry in src/pages/playground.astro with another chart slug.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title mentions docs/template standards, but the PR actually adds authelia to the site sync playground registry.	Rename it to reflect the real change, e.g. "feat(playground): register authelia in site sync".

✅ Passed checks (4 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.
Description check	✅ Passed	The description covers the summary, validation, chart PR, and issue reference, though it does not use the template's checklist format.

✨ 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/authelia-template-standards-sync

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