text: /* Hello world - using a pure component */
  
  const NestedComponent = () => (
    <h1>Hello World!</h1>
  );
  
  const renderHelloWorld = () => {
    ReactDOM.render(
     <div>
      This is a simple example of some JSX with a nested component
      <NestedComponent/>
  
      Refresh the page to return to the main menu.
    </div>,
    document.getElementById('root')
    );
  };
  
  addLink("Hello World", renderHelloWorld);
  
  