title: Using cdn instead of serving locally when using ng build --prod in Angular CLI
body: <p>I am serving the Bootstrap framework locally for my development. Currently, the way I do it is adding my bootstrap in angular-cli.json like this</p>
  
  <pre><code> "styles": [
          "../node_modules/bootstrap/dist/css/bootstrap.min.css",
          "styles.css"
        ],
  </code></pre>
  
  <p>By the way, I use </p>
  
  <blockquote>
    <p>ng build --prod</p>
  </blockquote>
  
  <p>when making my production build.</p>
  
  <p>Is there a quick and nice trick to make use of CDN instead when I build it for production? 
  Though I can achieve this by just manually add a bootstrap cdn in my index.html and delete the one in angular-cli.json. I am just wondering how you guys do it.</p>