[ADD] speaker 3 information

Author: hollydinkel

imgs/portrait_placeholder.png

@@ -185,10 +185,10 @@ <h5 style="margin-bottom:0em;"><a href="https://yunzhuli.github.io/" target="_bl
             Columbia University
           </div>
           <div class="col-lg-4 col-md-4 col-sm-6 col-xs-12 profile" style="padding-bottom: 30px;">
-            <a href="" target="_blank"><img src="imgs/portrait_placeholder.png"
-                class="rounded-circle" alt="tba" width="140" height="140"></a>
-            <h5 style="margin-bottom:0em;"><a href="" target="_blank">3. Speaker</a></h5>
-            tba
+            <a href="" target="_blank"><img src="imgs/speakers/siyuan_huang.png"
+                class="rounded-circle" alt="Siyuan Huang" width="140" height="140"></a>
+            <h5 style="margin-bottom:0em;"><a href="https://siyuanhuang.com/" target="_blank">Siyuan Huang</a></h5>
+            Beijing Institute for General Artificial Intelligence (BIGAI)
           </div>
         </div>
       </div>