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 0069dbe and 00cebbc.

📒 Files selected for processing (1)

• renovate.json

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Walkthrough

A single line in renovate.json is modified, replacing the extends preset value from "@TryGhost:quietJS" to "github>TryGhost/renovate-config". No other configuration fields are altered, and the change has no impact on control flow or error handling logic.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: replacing the Renovate preset configuration to use the renovate-config repo directly instead of an indirect package-style reference.
Description check	✅ Passed	The description is well-related to the changeset, providing clear context about replacing the @tryghost: preset with github>TryGhost/renovate-config and explaining the rationale for standardization and removing indirection.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ 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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