Use renovate-config directly for Renovate presets

[ErisDS]

Summary

• replace the legacy @tryghost:quietJS preset reference
• use github>TryGhost/renovate-config directly as the shared preset source
• align NQL with the current org standard for Renovate configuration

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 89b5ab3 and 83d948c.

📒 Files selected for processing (1)

• renovate.json

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Walkthrough

The renovate.json configuration file was updated to replace the Renovate extends preset from @tryghost:quietJS with github>TryGhost/renovate-config. This changes the configuration preset source that Renovate references for its rules without modifying the overall structure or other settings.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: replacing the Renovate preset source with a direct reference to the organization's renovate-config.
Description check	✅ Passed	The description is directly related to the changeset, explaining the motivation and details of replacing the legacy preset with the new direct configuration source.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/use-renovate-config-directly

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