lightning/docs/source-fabric/_templates/layout.html

{% extends "!layout.html" %}
<link rel="canonical" href="{{ theme_canonical_url }}{{ pagename }}.html" />

{% block footer %} {{ super() }}
<script script type="text/javascript">
  var collapsedSections = [
    "Best practices",
    "Optional Extensions",
    "Tutorials",
    "API References",
    "Bolts",
    "Examples",
    "Partner Domain Frameworks",
    "Community",
  ];
</script>

{% endblock %}