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 3b1be23 and 8e46b1f.

📒 Files selected for processing (1)

• renovate.json

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Walkthrough

The renovate.json configuration file is updated by changing the extends field value. The preset source is modified from "@TryGhost:quietJS" to "github>TryGhost/renovate-config", redirecting Renovate to use a GitHub-hosted configuration repository instead of the previous preset source. This is a single-line configuration change with no alterations to other fields or logic.

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 summarizes the main change: replacing the old preset reference pattern with a direct GitHub-hosted Renovate config reference.
Description check	✅ Passed	The description is directly related to the changeset, providing clear context about replacing @tryghost: preset usage with the github>TryGhost/renovate-config reference.
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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