Notifications tab

Closes #401 and #400 (closed)

src/boot/after_store.js

@@ -105,6 +105,7 @@ const setSettings = async ({ apiConfig, staticConfig, store }) => {
   copyInstanceOption('alwaysShowSubjectInput')
   copyInstanceOption('noAttachmentLinks')
   copyInstanceOption('showFeaturesPanel')
+  copyInstanceOption('webPushNotifications')
 
   if ((config.chatDisabled)) {
     store.dispatch('disableChat')