fedi-classifieds/_includes/footer.njk

<footer>
  <ul>
    <li>
      maintained by <a href="https://leecat.art" target="_blank">lee</a>
    </li>
    <li>
      <a href="https://heckin.technology/inherentlee/fedi-classifieds"
        target="_blank">source code</a>
    </li>
    <li>
      {% if page.url == "/" %}
        <a href="/submit/">submit your own</a>
      {% elif page.url == "/submit/" %}
        <a href="/">return home</a>
      {% endif %}
    </li>
  </ul>
</footer>