internal: Refactor config loading some more. * Remove fixup code in the app to make the app config class more standalone. * Remove support for old-style variants... maybe bring it back later. * Try and fix various bugs introduced by subtle config value overriding order changes.

{% extends "section-page.html" %}

{% block header %}
<header class="code">
    <h1>{{ page.title }}</h1>
</header>
{% endblock %}