Update README.md

README.md

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 Health Cards Framework: implementation guide and supporting material
 
 ## View the guide:
-To view the implementation guide formatted including diagrams, see:
-
-* https://hackmd.io/@HealthWallet/verifiable-lab-results
-* https://hackmd.io/@HealthWallet/modeling-healthcare-data-with-vcs
+To view the implementation guide formatted including diagrams, see https://healthwallet.cards/
 
 To propose changes, please use GitHub [Issues](https://github.com/smart-on-fhir/health-cards/issues) or create a [Pull Request](https://github.com/smart-on-fhir/health-cards/pulls).
-
-## Intro video (with demo, June 2020)
-* https://youtu.be/g7bZU5nmHIA