message: [frameworks] Remove blitz demo
  This is not ready yet. We need to confirm Blitz is working before we deploy the demo.
diff: {
  "name": "Blitz.js",
  "slug": "blitzjs",
  - "demo": "https://blitzjs.now-examples.now.sh",
  "logo": "https://raw.githubusercontent.com/vercel/vercel/master/packages/frameworks/logos/blitz.svg",
  "tagline": "Blitz.js: The Fullstack React Framework",
  "description": "A brand new Blitz.js app: the output of running `blitz new`",
  