[SUGGESTION] Add docs for dynamic NFTs

[dtbuchholz]

Description

The current NFT School documentation walks through the basics of NFT metadata. However, it does not address deeper metadata themes like dynamic metadata and how one could deploy this type of NFT.

Content

The content (linked below) is being proposed to add to the Metadata schemas subsection under the References section. It walks through the basics of "deeper" metadata (e.g., attributes) -- which aren't covered in much detail in existing docs -- and also adds new information around how one can create dynamic NFTs using nft.storage + other workflows.

Link to Content

Deeper & dynamic metadata