posts editable for only for author

application/templates/post_detail.html

     {% else %}
     <a class="btn btn-outline-dark" href="{% url 'post_publish' pk=post.pk %}">Publish</a>
     {% endif %}
+    {% if user.is_staff and user == post.author %}
     <a class="btn btn-outline-dark" href="{% url 'post_edit' pk=post.pk %}">
         <span class="glyphicon glyphicon-pencil">Edit</span>
     </a>
     <a class="btn btn-outline-dark" href="{% url 'post_remove' pk=post.pk %}">
         <span class="glyphicon glyphicon-remove">Remove</span>
     </a>
+    {% endif %}
     <h1>{{ post.title }}</h1>
     <p>{{ post.text|linebreaksbr }}</p>
 </div>