build: fix link to ibm plex sans font #6388

Job	Run time
Integration Tests	5m 40s
CI	2m 26s
Determine if Build & Deploy is needed	1s
Test	4m 10s
End To End Tests	15m 20s
Build and push for edu	3m 18s
Upload sourcemap to Sentry	2m 2s
Build and push for health	3m 12s
Build and push for gogov	3m 10s
Deploy to Elastic Beanstalk and AWS Lambda for gogov	3m 5s
Deploy to Elastic Beanstalk and AWS Lambda for edu	4m 53s
Deploy to Elastic Beanstalk and AWS Lambda for health	4m 58s
	52m 15s

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