[CSS] Improved performance, reduced padding [COMPONENTS][LeftPanel] Consolidated CSS into base.css [COMPONENTS][RightPanel] Consolidated CSS into base.css [PLUGINS][WebMonetization] Replaced fieldset with section

Accessibility tests failed if the fieldset had no legend, since it
wasn't really neeeded, it was replaced as another element.

components/Collection/templates/collection/actors.html.twig

@@ -4,7 +4,7 @@
 
 {% block body %}
 <section class="section-widget section-padding">
-    <h2 class="section-title">{{ title }}</h2>
+    <h1 class="section-title">{{ title }}</h1>
 
     <div>
         <p>{% trans %}Sort by:{% endtrans %}</p>
@@ -26,7 +26,7 @@
             {% endfor %}
             <p>{% trans %}Page: %page%{% endtrans %}</p>
         {% else %}
-            <h3>{{ empty_message }}</h3>
+            <h2>{{ empty_message }}</h2>
         {% endif %}
     </div>
 </section>

components/Collection/templates/collection/widget_add_to.html.twig

@@ -4,23 +4,23 @@
             <h2>{{ctitle}}</h2>
         </summary>
         {% if has_collections %}
-            <fieldset class="section-form">
+            <section class="section-form">
                 {{ form(add_form) }}
-            </fieldset>
+            </section>
 
             <details class="section-widget-subtitle-details section-padding"
                      title="Expand if you want to access more options.">
                 <summary class="section-subtitle-summary">
                     <strong>{% trans %}Other options{% endtrans %}</strong>
                 </summary>
-                <fieldset class="section-form">
+                <section class="section-form">
                     {{ form(create_form) }}
-                </fieldset>
+                </section>
             </details>
         {% else %}
-            <fieldset class="section-form">
+            <section class="section-form">
                 {{ form(create_form) }}
-            </fieldset>
+            </section>
         {% endif %}
     </details>
 </section>