fix: use todoPatterns for external link checker

[AaronFeledy]

Corrects the link checker config to use todoPatterns instead of skipPatterns for docs.backdropcms.org.

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Note

Low Risk
Config-only change to link-checking behavior; risk is limited to potentially noisier deploy-preview link check results.

Overview
Adjusts the Netlify deploy-preview netlify-plugin-checklinks configuration so docs.backdropcms.org is flagged via todoPatterns (instead of being skipped), while keeping only file-type exclusions (.rss, .gif, .jpg) in skipPatterns.

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