Add new onboarding flow to web UI (#24619)

app/javascript/mastodon/features/ui/util/async-components.js

@@ -150,8 +150,8 @@ export function Directory () {
   return import(/* webpackChunkName: "features/directory" */'../../directory');
 }
 
-export function FollowRecommendations () {
-  return import(/* webpackChunkName: "features/follow_recommendations" */'../../follow_recommendations');
+export function Onboarding () {
+  return import(/* webpackChunkName: "features/onboarding" */'../../onboarding');
 }
 
 export function CompareHistoryModal () {