{% macro help_section(title, subtitle='') -%}
  <article class="help-section">
    <header class="help-section__header">
      <h2>{{ title }}</h2>
      {% if subtitle %}<p class="muted">{{ subtitle }}</p>{% endif %}
    </header>
    <div class="help-section__body">{{ caller() }}</div>
  </article>
{%- endmacro %}