show education either in main or sidebar

combined education-section.html and education.html into one.

_includes/sidebar.html

@@ -45,7 +45,9 @@
        </ul>
    </div><!--//contact-container-->
 
-  {% include education.html %}
+  {% if site.education_in_main == null or site.education_in_main == false %}
+    {% include education.html %}
+  {% endif %}
   {% include language.html %}
   {% include interests.html %}
   {% if site.about %}