add unset RegionalAuth button

Author: mansisampat

packages/auth/demo/public/index.html

@@ -862,6 +862,7 @@ <h2>Sign in with your CIAM token</h2>
               </div>
               <button class="btn btn-primary" id="initialize-regional-auth-btn">Initialize Regional Auth</button>
               <div id="regional-auth-status"></div>
+              <button class="btn btn-default" id="clear-regional-auth-id-btn">Clear Regional Auth Instance</button>
               <hr>
 
               <!-- Set Token Refresh Handler -->