page__hero.html

<div class="page__hero">
  <img src=
    {% if page.header.image contains "http" %}
      "{{ page.header.image }}"
    {% else %}
      "{{ page.header.image | prepend: "/images/" | prepend: base_path }}"
    {% endif %}
    alt="{{ page.title }}" class="page__hero-image">
  {% if page.header.caption %}
    <span class="page__hero-caption">{{ page.header.caption | markdownify | remove: "<p>" | remove: "</p>" }}</span>
  {% endif %}
</div>