preload icons and pause on setup complete for kiosk mode (#1997)

* preload two icons

* pause on setup complete for 4 seconds before redirecting kiosk mode

frontend/projects/ui/src/app/app/preloader/preloader.component.ts

@@ -39,6 +39,7 @@ const ICONS = [
   'finger-print-outline',
   'flash-outline',
   'folder-open-outline',
+  'globe-outline',
   'grid-outline',
   'help-circle-outline',
   'hammer-outline',
@@ -70,6 +71,7 @@ const ICONS = [
   'remove',
   'remove-circle-outline',
   'remove-outline',
+  'repeat-outline',
   'rocket-outline',
   'save-outline',
   'settings-outline',