Revert "Migrate to Zola 0.23"

This reverts commit 4f7b33de1f.

templates/shortcodes/service_box.html

@@ -1,4 +1,3 @@
-{% component service_box(title, href, description="", img="") %}
 <div class="service_box">
 	<a class="service_box-link" href="{{href|safe}}">
 		{% if img %}<div class="service_box-img_wrap"><img class="service_box-img" src="{{img|safe}}" alt="{{title}}" aria-hidden/></div>{% endif %}
@@ -6,4 +5,3 @@
 		<span class="service_box-description">{{description|safe}}</span>{% endif %}
 	</a>
 </div>
-{% endcomponent service_box %}