title: issue with eleventy nunjucks exporting template code
body: <p>any ideas why my configuration is exporting njk code instead of content?</p>
  
  <pre><code>&lt;body class="font-sans" id="top" itemscope itemtype="http://schema.org/WebPage"&gt;
  
    {{ content | safe }}
  
    &lt;script src="scripts/index.js"&gt;&lt;/script&gt;
  
    { % include 'footer.njk' % }
  
  &lt;/body&gt;
  </code></pre>
  
  <p><img src="https://user-images.githubusercontent.com/957271/82112303-933ece00-9786-11ea-9e10-2b8f34de50a4.png" alt="image"></p>