mkdocs-material/material/partials/social.html

{% if config.extra.social %}
  <div class="md-footer-social">
    <link rel="stylesheet" href="{{ base_url }}/assets/fonts/font-awesome.css">
    {% for social in config.extra.social %}
      <a href="{{ social.link }}" class="md-footer-social__link fa fa-{{ social.type }}"></a>
    {% endfor %}
  </div>
{% endif %}