♻️ refactor: format date as "6 July 2049"

Follows Oxford's and other formal style manuals.

templates/macros/list_posts.html

@@ -13,7 +13,7 @@
 
             {% if post.date %}
                 <div class="date">
-                    {{ macros_format_date::format_date(date=post.date) }}
+                    {{ post.date | date(format=config.extra.date_format | default (value="%d %B %Y")) }}
                 </div>
             {% endif %}