Add links indicators to section headers

Author: chennes

_layouts/default.html

@@ -58,7 +58,7 @@ <h2 id="project_tagline">{{ site.description | default: site.github.project_tagl
     <!-- MAIN CONTENT -->
     <div id="main_content_wrap" class="outer">
       <section id="main_content" class="inner">
-        {{ content }}
+        {% include anchor_headings.html html=content anchorBody="#" %}
       </section>
     </div>