Integrate contracts

[Jonatan-Chaverri]

Description

The following changes are introduced in here

• Add marketplace unit test
• Fix minor issues in the contracts
• Created a deploy script for the contracts.
• Add README with detailed instructions on how to deploy the contracts and frontend.
• Integrate contracts with frontend. The following flows are working now: user can now mint new products, buy them and claim their respective payment.
• Removed some mocked data, now the data only shows real products.
• Set base_uri for tokens to mint and add metadata functionality

[vercel]

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