Update build-an-nft-marketplace.mdx

[max-crawford]

updated copy on the NFT marketplace.

Two flags for Ryan:

The final cards need fixes.

One leads to a 404. The other references "Clerk" and I have no idea what that is

What should we lead devs to instead here? The other guides?

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• [ ] Conventional commits were used
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• [ ] For fixes/refactors: all existing references were identified and replaced
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• [ ] Clear code samples were provided
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