home-assistant.io/source/_includes/post/author.html

{% if post.author %}
  {% assign author = post.author %}
{% elsif page.author %}
  {% assign author = page.author %}
{% else %}
  {% assign author = site.author %}
{% endif %}
{% if author %}
  {% assign person = site.data.people[author] %}
  {% if person %}
    <span class="byline author vcard">
      <a href="https://github.com/{{ person.github }}" target="_blank"><img class="author-avatar" src="https://avatars.githubusercontent.com/{{ person.github }}?size=64" alt="{{ person.name }}"/> {{ person.name }}</a>
    </span>
  {% else %}
    <span class="byline author vcard">{% icon "mdi:person" %} {{ author }}</span>
  {% endif %}
{% endif %}