more FA5 stuff with small related refactoring

src/components/notifications/notifications.js

@@ -6,6 +6,12 @@ import {
   filteredNotificationsFromStore,
   unseenNotificationsFromStore
 } from '../../services/notification_utils/notification_utils.js'
+import { library } from '@fortawesome/fontawesome-svg-core'
+import { faCircleNotch } from '@fortawesome/free-solid-svg-icons'
+
+library.add(
+  faCircleNotch
+)
 
 const DEFAULT_SEEN_TO_DISPLAY_COUNT = 30