buz

This is just a quick POC I made the other day. Needs cleanup, proper testing, relative placement using `lipgloss.Position` and the ability to place the overlay outside of the background...

According the the spec and [docs](https://docs.commercetools.com/api/projects/messages#inventoryentry-created) the `inventoryEntry` field of the `InventoryEntryCreated` message should contain an [InventoryEntry](https://docs.commercetools.com/api/projects/inventory#inventoryentry). The messages API instead returns the following structure (didn't check the format in...