Use renovate-config repo directly for Renovate presets

[ErisDS]

Summary

• replace package-style @tryghost: preset usage with github>TryGhost/renovate-config
• standardize shared Renovate configuration on the dedicated renovate-config repository
• remove indirection from older preset reference patterns

[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 33dac86 and 5bcebb8.

📒 Files selected for processing (1)

• renovate.json

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Walkthrough

The renovate.json configuration file was updated to replace two separate Renovate preset extends entries with a single entry. The previous configuration extended "@TryGhost:quietJS" and "@TryGhost:automergeDevDependencies" presets; these were consolidated into a single "github>TryGhost/renovate-config" entry that sources presets from a GitHub-hosted TryGhost Renovate configuration repository.

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 accurately reflects the main change: replacing package-style preset references with direct references to the renovate-config repository.
Description check	✅ Passed	The description is directly related to the changeset, providing clear context about replacing package-style presets with direct GitHub repository references.
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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_{Comment @coderabbitai help to get the list of available commands and usage tips.}