formatting: Remove segment parts, you can use template tags instead. Segment parts were used to switch formatters insides a given content segment, but that's also achievable with template tags like `pcformat` in Jinja to some degree. It's not totally the same but removing it simplifies the code and improves performance.

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

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