updated academy

Author: Tsung-Wei Huang

index.html

@@ -85,9 +85,9 @@ <h1><b>Taskflow </b><img src="images/logo.png" alt="Logo" style="width:2.5rem;">
           <footer class="blockquote-footer"><cite style="color:#f5f5f5">write parallel programs with high performance and simultaneous high productivity</cite></footer>
         </blockquote>
 
-        <p><a class="btn btn-primary btn-lg mr-2 mt-2" href="https://github.com/taskflow/taskflow" role="button">GitHub &raquo;</a>
-        <a class="btn btn-info btn-lg mr-2 mt-2" href="https://taskflow.github.io/taskflow/index.html" role="button">Handbook &raquo;</a>
-        <a class="btn btn-warning btn-lg mr-2 mt-2" href="https://taskflow.github.io/taskflow/release-3-11-0.html" role="button">Releases (latest v3.11) &raquo;</a></p>
+        <p><a class="btn btn-primary btn-lg mr-2 mt-2" href="https://github.com/taskflow/taskflow" role="button">GitHub&raquo;</a>
+        <a class="btn btn-info btn-lg mr-2 mt-2" href="https://taskflow.github.io/taskflow/index.html" role="button">Handbook&raquo;</a>
+        <a class="btn btn-warning btn-lg mr-2 mt-2" href="https://github.com/taskflow/academy" role="button">Academy&raquo;</a></p>
       </div>
     </div>