[Glitch] refactor: Use new main menu as "Getting started" column in Advanced Web UI

Port d28a4428b5 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/ui/util/async-components.js

@@ -50,10 +50,6 @@ export function GettingStarted () {
   return import('../../getting_started');
 }
 
-export function GettingStartedMisc () {
-  return import('../../getting_started_misc');
-}
-
 export function KeyboardShortcuts () {
   return import('../../keyboard_shortcuts');
 }