tidy up react app example #643

Job	Run time
build (aws-lambda-http)	39s
build (aws-lambda-custom-runtime)	42s
build (aws-lambda-events)	42s
build (bearer-auth)	1m 10s
build (graalvm)	1m 9s
build (hello-world)	33s
build (hexagonal)	40s
build (hotwire)	34s
build (http4k-connect)	1m 13s
build (graphql)	34s
build (json-api)	39s
build (oauth)	35s
build (openapi)	38s
build (quarkus)	56s
build (react-app)	34s
build (typesafe-configuration)	36s
build (web-content)	36s
build (websockets)	39s
	13m 9s

Provide feedback