refactor: add alert to notify user

after upgrading show alert to notify user to clear old cache by hard refresh

Signed-off-by: Pranav C <pranavxc@gmail.com>

packages/nc-gui/app.html

@@ -9,8 +9,8 @@
 <script>
   setTimeout(() => {
     if (document.getElementById('nuxt-loading')) {
-      if (!(window.$nuxt && window.$nuxt._isDev) && confirm('If you upgraded NocoDB, please click OK')) {
-        window.location.reload(true)
+      if (!(window.$nuxt && window.$nuxt._isDev) ) {
+        alert('If you upgraded NocoDB, please do a hard refresh. \r\n\r\nMac users do : cmd + shift + r \r\nOther users do : ctrl + shift + r')
       }
     }
   }, 16000)