message: mstarch: adding getting-started back to navagation
diff: <!--li class="nav-item">
  <a class="nav-link" href="projects.html">Projects</a>
  </li-->
  - <!--li class="nav-item">
  + <li class="nav-item">
  <a class="nav-link" href="getting-started.html">Getting Started</a>
  - </li-->
  + </li>
  <li class="nav-item">
  <a class="nav-link" href="https://github.com/nasa/fprime">View on GitHub</a>
  </li>
  