Revert "Migrate to Zola 0.23"

This reverts commit 4f7b33de1f.

templates/shortcodes/square_box.html

@@ -1,8 +1,6 @@
-{% component square_box(title) %}
 <div class="square_box">
 	<div class="square_box-inner square_box-inner-bottom" onmouseenter="randomize_square_box(this)">
 		<span class="square_box-title">{{ title | safe }}</span>
-		<p class="square_box-text">{{ body | safe }}</p>
+		<p class="square_box-text">{{ text | safe }}</p>
 	</div>
 </div>
-{% endcomponent square_box %}