add: html footer config

crates/app/src/public/html/root.html

@@ -90,6 +90,7 @@ macros -%}
                 </main>
             </article>
             {% else %} {% block body %}{% endblock %} {% endif %}
+            <!-- html_footer_goes_here -->
         </div>
 
         <script data-turbo-permanent="true" id="init-script">