start using preview version of ivy in angular code example

Example 1: hw to disable Ivy

content_copy
      
      {
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "outDir": "./out-tsc/app",
    "types": []
  },
  "files": [
    "src/main.ts",
    "src/polyfills.ts"
  ],
  "include": [
    "src/**/*.d.ts"
  ],
  "angularCompilerOptions": {
    "enableIvy": false
  }
}

Example 2: how stop ivy in angualr 9

npm i -g @angular/cli@latestng update