docs(create-next-app): copy changes from #42012 to package-level README (#42217)
docs(create-next-app): copy changes from #42012 to package-level README (#42217)

Just ensures the README for the package and the README on the nextjs.org
site match regarding interactive mode etc.
JeromeFitz/next.js,JeromeFitz/next.js,JeromeFitz/next.js,JeromeFitz/next.js