Adding the hamburger menu icon

Let's add a div tag right on top of the primary-nav in both the index.html file and the shark-movies.html file. We'll give it a class of mobile-menu-icon; that's going to be important:

<!--===============Nav===============--><nav class="grouping">    <figure>        <img src="images/sharky.png" alt="Shark">    </figure>    <div class="mobile-menu-icon"></div>    <ul class="primary-nav grouping">        <li><a href="#">Home</a></li>        <li class="has-submenu"><a href="shark-movies.html">Movies</a>            <ul>                <li class=""><a href="">Jaws</a></li>                <li class=""><a href="">Sharknado</a></li>                <li class=""><a href="">Open Water</a></li>            </ul>       </li>        <li><a href="#">Species</a></li>        <li><a href="#">Chum</a></li>    </ul></nav>

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