Refactor event header markup for improved subtitle handling.

The subtitle block was moved inside its container for better structure and readability. This ensures that the 'event-title-container' only wraps the subtitle when it exists, eliminating unnecessary empty containers.

core/templates/core/event_page.html

@@ -70,12 +70,11 @@
     {% endif %}
 
     <!-- Event Header -->
-    <div class="event-title-container">
-        <h1 class="event-title">{{ self.title }}</h1>
-        {% if self.subtitle %}
+    {% if self.subtitle %}
+        <div class="event-title-container">
             <h2 class="event-subtitle">{{ self.subtitle }}</h2>
-        {% endif %}
-    </div>
+        </div>
+    {% endif %}
 
     <div class="row">
         <!-- Event Images (Moved to left) -->