navbar not rendering in browser using ng-bootstrap & angular 4

I am building my first Angular 4 app, using ng-bootstrap (Bootstrap 4 for Angular) - not using regular Boostrap

The ng-bootstrap website (https://ng-bootstrap.github.io/#/components/accordion/api) does not list a component for a navbar (as it did in Bootstrap 3 or regular bootstrap 4). Does that mean I have to build a menu out of dropdowns/buttons? Or I have to mix regular Bootstrap 4 with ng-bootstrap?

I tried creating this menu in the html but it won't render in the browser (just a brand "MyWebSiteName" and little grey box on my screen, no nav)

<nav class="navbar navbar-inverse">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">MyWebSiteName</a>
    </div>
     <div class="collapse navbar-collapse" id="myNavbar">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Page 1 <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Page 1-1</a></li>
            <li><a href="#">Page 1-2</a></li>
            <li><a href="#">Page 1-3</a></li>
          </ul>
        </li>
        <li><a href="#">Page 2</a></li>
        <li><a href="#">Page 3</a></li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
        <li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
      </ul>
    </div>
  </div>
</nav>

I something wrong with this HTML ? Or does someone have an example of a Navbar that works with ng-bootstrap?