This extension have been moved into the Roc extension monorepo here.
January 2, 2018 ยท View on GitHub
This change has been made to make it easier to work with the extensions overall and release new versions quickly. Please use this repo for reporting issues and open pull requests.
The code for roc-package-web-app can be found here.
The code for roc-package-web-app-dev can be found here.
roc-package-web-app 
Package for building web applications using Roc
To be used together with Roc.