This is a demo of using @jbrowse/react-app installed from NPM with
create-react-app v5 (which uses webpack 5)
It uses craco to add the webpack NodePolyfillPlugin (used for Buffer polyfill, etc)
See this app running at https://jbrowse.org/demos/app-cra5/.
Run yarn and then yarn start to start a development instance
Run yarn build which produces a build directory that can be deployed to a
static web server