feat(trufflehog): exclude website content/about/404.md #730

Job	Run time
Check whether there are things to scan	3s
Run zizmor / job-workflow-ref	21s
Run zizmor / Generate and upload zizmor results 🌈	28s
Run zizmor / Send zizmor metrics to Prometheus via Grafana Bench	9s
	1m 1s

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