feat(place-order): Adds a mobile device test

templates/page-place-order.html

@@ -16,6 +16,20 @@
 
 {% block js %}
 
+
+  <script>
+    (function () {
+      function deviceIsMobile() {
+        // https://coderwall.com/p/i817wa/one-line-function-to-detect-mobile-devices-with-javascript
+        return (typeof window.orientation !== 'undefined') || (navigator.userAgent.indexOf('IEMobile') !== -1);
+      };
+
+      if (deviceIsMobile()) {
+        alert('The online crate configuration tool is not available for mobile browsers yet. Please use a desktop computer or email us at sales@m-l****.hk to get a quote.');
+      }
+    })();
+  </script>
+
   <!-- Load React. -->
   <!-- Note: when deploying, replace "development.js" with "production.min.js". -->
   <!-- v16 -->