simple layout for examples

docs/_layouts/simple.html

+---
+layout: default
+---
+
+<div class="container bd-content">
+  {% include ads.html %}
+  <h1 class="bd-title">{{ page.title }}</h1>
+  {{ content }}
+</div>

docs/examples/index.md

 ---
-layout: page
+layout: simple
 title: Examples
 ---