update thumbnail pic location

Author: Yueqiao12Zhang

lab_members/undergraduate/yueqiao_zhang/index.html

@@ -79,7 +79,7 @@ <h1 style="text-align: left;" class="page-title">Yueqiao Zhang</h1>
           </div>
           <div class="img-wrap">
             <!-- TODO: link your image here. If you want a placeholder image, leave as-is -->
-            <img class="profile-photo" src="../../../assets/lab_members/yueqiao_zhang.JPG"/>
+            <img class="profile-photo" src="../../../assets/lab_members/thumbnail/yueqiao_zhang.JPG"/>
             <div class="social-links">
               <!-- TODO: link your Github in the href attribute here, or comment out the entire <a> tag -->
               <a class="social__link" target="_blank" rel="noopener noreferrer" href="https://github.com/Yueqiao12Zhang">
@@ -194,4 +194,4 @@ <h4 class="lab_member_subtitles">Publications </h4>
       });
     </script>
   </body>
-</html>
+</html>