Add support for folders in Notion iOS app.

In my Notion iCloud folder I have organized compositions further into subfolders. However when organized into subfolders, they will not load
through the iOS application. I would suggest making folders visible in the app and the compositions within them playable, because as it is now, all compositions even in sub-folders (in the Notion iCloud folder on the computer) do show up, but they are all in one big list, and any who are in a subfolder in the iCloud location are not able to load from the app.