Feat/voucherify2

[marcin-slezak]

Background

Integrating Composable UI with Voucherify using strategy suggested by Orium team:

Our approach involves two separate PRs. The first PR will update the core aspects of our Composable UI, specifically the Next.js application, the commerce-generic package, and the UI components. This includes refining Types and functions to support discounts and coupon codes, designed to remain general and not Voucherify-specific. In other words, no need for a wrapper, we can simply update the commerce-generic package directly with enhanced types and functions.

The second PR introduces the Voucherify package + documentation. This includes functions for cart operations to be used in the commerce-generic package (addItem, updateItem, removeItem, create, addCoupon, removeCoupon). The installation steps would involve calling your functions before returning the cart in each cart operation, so about 5 lines of code + the import of your package. The installation could be facilitated with a script if you'd like.