Revert "Migrate to Zola 0.23"

This reverts commit 4f7b33de1f.

templates/shortcodes/partner_box.html

@@ -1,3 +1 @@
-{% component partner_box(url, title, img) %}
 <a class="partner_box-link" href="{{url|safe}}" title="{{title}}"><img class="partner_box-img" src="{{img|safe}}" alt="{{title}}" loading="lazy"/></a>
-{% endcomponent %}