zola-theme-terminimal/templates/shortcodes/image.html

{% if src %}
  {# If the image's URL is internal to the site... #}
  {% if src is not starting_with("http") %}
    {# ... then prepend the site's base URL to the image's URL. #}
    {% set src = config.base_url ~ src %}
  {% endif %}
  <img src="{{ src | safe }}"{% if alt %} alt="{{ alt }}"{% endif %} class="{% if position %}{{ position }}{% else -%} center {%- endif %}" {%- if style %} style="{{ style | safe }}" {%- endif %} decoding="async" loading="lazy"/>
{% endif %}