message: [frameworks] Add link to demo for RedwoodJS
diff: {
  "name": "RedwoodJS",
  "slug": "redwoodjs",
  + "demo": "https://redwoodjs.now-examples.now.sh",
  "logo": "https://raw.githubusercontent.com/vercel/vercel/master/packages/frameworks/logos/redwood.svg",
  "tagline": "RedwoodJS is a full-stack framework for the Jamstack.",
  "description": "A RedwoodJS app, bootstraped with create-redwood-app.",
  