Credit, Market: Refactor credit cards details to use data from conf/commerce

[erikrakuscek]

Work on this issue once enh/120/new-buy-drawer branch is merged to main.

Move all details about credit cards from src/content/cards to conf/commerce. This way we will get rid of duplicated data and have all credit card data in one place.

Refactor the code on credit site to use this data and stick to the new naming of product tree nodes.
Product families: black, elite, founder, sovereign
Products: 24k gold elite card, sterling silver elite card, etc.

[artemis-prime]

Please confer w me on this since there are a few nuances @zeekay

[artemis-prime]

We don't need this for mvp. It's strictly a internal thing