Disable "deploy" hint if "deploy" exists in package.json "scripts" #1221

The build folder is ready to be deployed.
To publish it at https://xxx.github.io/yyy/, run:

  yarn add --dev gh-pages

Add the following script in your package.json.

    // ...
    "scripts": {
      // ...
      "deploy": "npm run build&&gh-pages -d build"
    }