added discord link in join us button.

Author: RamakrushnaBiswal

website2.0/contributor.html

@@ -507,8 +507,10 @@ <h2>Join our awesome team!</h2>
             Be a contributor and improve HelpOps-Hub and help fellow developers.
           </p>
         </div>
-        <button class="join-button"> Join us now ->
+        <a href="https://discord.gg/UWTrRhqywt">
+        <button class="join-button"> Join us now &#8594;
         </button>
+        </a>
       </div>
 
       <button id="load-more" style="display: none">See More</button>