message: Update header.component.html
diff: <li><a id="about" routerLink="/about" routerLinkActive="active">About Us</a></li>
  <li><a id="about" routerLink="/consultants" routerLinkActive="active">Consultation</a></li>
  <li><a id="about" routerLink="/partners" routerLinkActive="active">Partners</a></li>
  - <li><a id="about" routerLink="/appreciations" routerLinkActive="active">Appreciations</a></li>
  + <li><a id="about" routerLink="/appreciations" routerLinkActive="active">Heroes</a></li>
  <li><a target="_blank" href="http://forum.code4socialgood.org/">Forum</a></li>
  <li><a target="_blank" href="http://join-our-slack.code4socialgood.org/">Chat</a></li>
  </ul>
  