message: fix(icon): Add index.scss to package.json for css icon
diff: "license": "Apache-2.0",
  "files": [
  "dist",
  - "lib"
  + "lib",
  + "index.scss"
  ],
  "style": "dist/canvas-kit-css-icon.min.css",
  "main": "dist/canvas-kit-css-icon.min.js",
  