docs(countly): sync playground coverage

[mberlofa]

Summary

• add countly to the Helm values playground eligibility map required by the chart sync check

Validation

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

Chart PR: helmforgedev/charts#655
Issue: helmforgedev/charts#633

Summary by CodeRabbit

• New Features
  • Added the Countly chart to the playground’s available chart list, making it visible even when it isn’t marked as stable.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 4071c733-fd5f-484f-a142-aafe2b5ca4a9

📥 Commits

Reviewing files that changed from the base of the PR and between 92428e0 and c278f30.

📒 Files selected for processing (1)

• src/pages/playground.astro

🚧 Files skipped from review as they are similar to previous changes (1)

• src/pages/playground.astro

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📝 Walkthrough

Walkthrough

Adds the countly chart slug to siteSyncPlaygroundConfigs in src/pages/playground.astro, causing it to be included in configuredChartSlugs and pass the playgroundCharts filter regardless of its maturity status.

Changes

Playground Config Update

Layer / File(s)	Summary
Add countly to playground configs src/pages/playground.astro	Adds countly to siteSyncPlaygroundConfigs, including it in configuredChartSlugs and the playgroundCharts filter.

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

Possibly related PRs

• helmforgedev/site#322: Also updates src/pages/playground.astro by adding a chart slug to siteSyncPlaygroundConfigs, changing the same filter path.
• helmforgedev/site#330: Also extends siteSyncPlaygroundConfigs in src/pages/playground.astro to include additional chart slugs.

Suggested labels: None

Suggested reviewers: None

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately describes the Countly playground sync coverage change.
Description check	✅ Passed	The description covers the summary and validation steps, with only minor template deviations and no blog section needed.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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