message: docs: update contributing page
  PR Close
diff: <a href="https://github.com/angular/angular/blob/master/CONTRIBUTING.md" class="button button-blue" md-button>Contribute</a>
  </div>
  + <div class="card-section">
  + <div>
  + <h3 class="no-anchor">Angular CLI</h3>
  +
  + Angular CLI makes it easy to create an application that already works, right out of the box. It already follows our best practices.
  +
  + </div>
  +
  + <a href="https://github.com/angular/angular-cli/blob/master/CONTRIBUTING.md" class="button button-blue" md-button>Contribute</a>
  + </div>
  +
  <div class="card-section">
  <div>
  <h3 class="no-anchor">Angular Material</h3>
  to build your Angular app.
  </div>
  - <a href="https://github.com/angular/angularfire2" class="button button-blue" md-button> Contribute</a>
  + <a href="https://github.com/angular/angularfire2/blob/master/CONTRIBUTING.md" class="button button-blue" md-button> Contribute</a>
  </div>
  </article>
  