_layouts/default.html (14 lines of code) (raw):
<!DOCTYPE html>
<html lang="en">
{% include header.html %}
<body>
{% include navbar.html %}
<div class="container">
<div class="content">
{{content}}
</div>
</div>
{% include footer.html %}
<script src="https://www.apachecon.com/event-images/snippet.js"></script>
</body>
</html>