update config and layouts

_config.yml

@@ -1,5 +1,3 @@
 theme: jekyll-theme-cayman
 title: PyRoboLearn
 description: A Python Framework for Robot Learning Practitioners
-examples: https://github.com/robotlearn/pyrobolearn/tree/master/examples
-  

_layouts/default.html

@@ -27,7 +27,7 @@
       <h2 class="project-tagline">{{ page.description | default: site.description | default: site.github.project_tagline }}</h2>
       {% if site.github.is_project_page %}
         <a href="{{ site.github.repository_url }}" class="btn">View on GitHub</a>
-        <a href="{{ page.examples }}" class="btn">View Examples</a>
+        <a href="https://github.com/robotlearn/pyrobolearn/tree/master/examples" class="btn">View Examples</a>
       {% endif %}
       {% if site.show_downloads %}
         <a href="{{ site.github.zip_url }}" class="btn">Download .zip</a>