Upgrade stickers

As part of the ongoing feedback from the community, the project wanted to lower the perceived barrier of entry to build an attractive Zaparoo collection. The Zaparoo Upgrade labels seek to accomplish this by giving users the option to make or purchase blank trading cards or pre-printed PVC card stickers, and then later, easily apply artwork to predefined areas that share standard dimensions. Since the artwork area is a simple rectangle, no special tools are required to cut them out.