chore: update all templates (#7731)

Old blank templates had invalid pregenerated importMap. Would error for
fresh apps from create-payload-app. And website was on an old version
riddled with bugs

templates/with-vercel-postgres/src/app/(payload)/admin/importMap.js

@@ -1,5 +1 @@
-import { emptyComponent as emptyComponent_0 } from '@payloadcms/ui/shared'
-
-export const importMap = {
-  '@payloadcms/ui/shared#emptyComponent': emptyComponent_0,
-}
+export const importMap = {}