Tidy templates

source/_layouts/page.html.twig

@@ -1,5 +1,5 @@
 {% extends 'default' %}
 
 {% block content_top %}
-    <h1 class="text-blue mb-4">{{ page.title }}</h1>
+    <h1>{{ page.title }}</h1>
 {% endblock %}

source/_layouts/talk.html.twig

@@ -1,12 +1,9 @@
 {% extends 'default' %}
 
 {% block content_wrapper %}
-    <div>
     <div class="markdown">
-            {{ page.summary|markdown }}
         {% block content %}{% endblock %}
     </div>
-    </div>
 
     {% include 'talk/slides' %}
     {% include 'talk/video' %}