[ADD/RM] replace .gif pic with .jpg

Author: hollydinkel

imgs/organizers/holly_dinkel.gif

@@ -206,7 +206,7 @@ <h2>Organizers</h2>
       <div class="grid profiles">
         <div class="row">
           <div class="col-lg-4 col-md-4 col-sm-6 col-xs-12 profile" style="padding-bottom: 30px;">
-            <a href="https://hollydinkel.github.io/" target="_blank"><img src="imgs/organizers/holly_dinkel.gif"
+            <a href="https://hollydinkel.github.io/" target="_blank"><img src="imgs/organizers/holly_dinkel.jpg"
                 class="rounded-circle" alt="Holly Dinkel" width="140" height="140"></a>
             <h5 style="margin-bottom:0em;"><a href="https://hollydinkel.github.io/" target="_blank">Holly Dinkel</a></h5>
             University of Illinois