Add Renovate config from renovate-config repo

[ErisDS]

Summary

• add Renovate configuration for this repository
• use github>TryGhost/renovate-config as the shared preset source
• align this repository with the org standard Renovate setup

[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 51273f6 and 840a904.

📒 Files selected for processing (1)

• renovate.json

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Walkthrough

A new renovate.json configuration file is introduced at the repository root. The file extends Renovate settings from an external shared configuration source ("github>TryGhost/renovate-config"). This enables dependency update automation by inheriting predefined Renovate rules while allowing repository-specific configuration overrides.

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 accurately and concisely summarizes the main change: adding a Renovate configuration file that references the shared renovate-config repository preset.
Description check	✅ Passed	The description clearly explains the purpose of the changes, specifying the shared preset source and alignment with organizational standards, which directly relates to the renovate.json addition.
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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