Change fig format from pdf to png

scipost/templates/scipost/PlanSciPost.html

@@ -28,7 +28,7 @@
       <li><strong>A central Journal for top-level breakthroughs selected from field-leading titles</strong></li>
     </ul>
     <p class="ml-2 mr-2">The general architecture is illustrated as follows:</p>
-    <img src="{% static 'scipost/2018_10_SciPost_Journals_plan.pdf' %}"></img>
+    <img src="{% static 'scipost/2018_10_SciPost_Journals_plan.png' %}"></img>
 
     <p class="ml-2 mr-2">Within a given field, the set of journal titles is designed to respond to and serve field-specific needs (see the example of our family of <a href="{% url 'journals:journals' %}#physics">Physics Journals</a>). Each Journal must however follow our peer-witnessed refereeing workflow and general Editorial College-based procedures. Moreover, each field is to feature a field-leading title mirroring our pioneering Journal <a href="{% url 'journal:about' 'SciPostPhys' %}">SciPost Physics</a> (and in particular implementing promotion of selected extended abstracts for publication in <a href="{% url 'journals:journals' %}#selections">SciPost Selections</a>).</p>