The create-crc-app in the frontend-components/packages folder has been deprecated in favour or the frontend-starter-app. 
https://github.com/RedHatInsights/frontend-components/
https://github.com/RedHatInsights/frontend-starter-app/

Last release was 2 years ago.
https://www.npmjs.com/package/create-crc-app

The package should be deprecated on the npm registry and deleted from the repo. 
https://docs.npmjs.com/deprecating-and-undeprecating-packages-or-package-versions