added post navigation

- added links to previous/next post

_layouts/post.html

@@ -12,6 +12,7 @@
   <section class="{{ page.section-type }}">
     <div class="container">
       <div class="row">
+        <div class="PageNavigation">
         <br />
         <h1 class="">{{page.title}}</h1>
         <div class="post-info">
@@ -28,6 +29,15 @@
         </div>
         {{ page.content | markdownify }}
       </div>
+      <p class="post-nav">
+      {% if page.previous.url %}
+        <a class="post-prev" href="{{site.baseurl}}{{page.previous.url}}">&laquo; {{page.previous.title}}</a>
+      {% endif %}
+      {% if page.next.url %}
+        <a class="post-next" href="{{site.baseurl}}{{page.next.url}}">{{page.next.title}} &raquo;</a>
+      {% endif %}
+      </p>
+    </div>
     </div>
   </section>