我需要alchemy-cms从 5.2 降级到 4.6，我该怎么做？
当我执行 rake 命令时，例如：
$bin/rake db:migrate
我收到这条消息：
== 20211109024146 RemoveVisibleFromAlchemyPages: migrating ====================
You have invisible pages in your database! Please re-structure your page tree before running this migration. You might also downgrade to Alchemy 4.6 and run the `alchemy:upgrade:4.6:restructure_page_tree` rake task.