We work with two branches.
The first one called "master" devote to the production server. The secont called "dev" is for development.
For better development please start from master and after switch to Dev.
item.json contains information about all products - icons, discounts, etc. To add the DIY icon to a product, change the "icon" field for this product in the items.json file to "DIY". Site supports only DIY icon.