moving wso2 theme to emm - removing duplicated styles for buttons and links, navbar style update

components/device-mgt/org.wso2.carbon.device.mgt.ui/src/main/resources/jaggeryapps/devicemgt/app/units/cdmf.unit.ui.navbar.nav-menu/nav-menu.hbs

@@ -105,8 +105,7 @@
          data-offset-top="80">
         <ul class="sidebar-messages">
         </ul>
-        <h4 class="text-center"><a href="{{appContext}}notification-listing" class="text-center">Show all notifications</a>
-        </h4>
+        <div class="text-center"><a href="{{appContext}}notification-listing" class="btn btn-primary">Show all notifications</a></div>
     </div>
 {{/zone}}
 {{#zone "bottomJs"}}