Adds section intro for Essentials
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<li><a href="intro.html">Introduction</a></li>
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<li class="dropdown-header">Data science essentials</li>
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<li class="dropdown-header"><a href="essentials.html">Data science essentials</a></li>
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<li><a href="visualize.html">Visualize</a></li>
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<li><a href="transform.html">Transform</a></li>
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<li><a href="tidy.html">Tidy</a></li>
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