v4 NFT docs

[akshay-ap]

Fixes #781

Changes proposed in this PR:

• Create an introductory page for NFT + v4
• Create a roles page

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[akshay-ap]

https://deploy-preview-780--docs-oceanprotocol.netlify.app/concepts/v4-nft/

https://deploy-preview-780--docs-oceanprotocol.netlify.app/concepts/nft/

[akshay-ap]

https://deploy-preview-780--docs-oceanprotocol.netlify.app/concepts/v4-roles/

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[kremalicious]

Some quotes from various meetings describing the relationship between NFT & datokens we might want to use in here.

@trentmc correct me if I'm wrong with the following blurbs but trying to get the very dry language of this doc draft introducing new terms into something easily readable and understandable. We now have the challenge that people got used to having the datatoken, and its symbol, as the (unique, not technically but de facto) representation for each asset. Rugpullindex & Alga app as case in point. So we need to make the relationship between a newly introduced token now actually uniquely representing the dataset really clear as quickly outlined here.

Data NFTs represent the intellectual property over an asset, while datatokens attached to asset services define and allow access to the asset.

While the NFT could be traded outside of Ocean Market and therefore itself being priced, the actual asset price for download/compute continues to be defined by an attached datatoken/OCEAN pool for pool assets.

The NFT represents the ownership over an asset, whoever has the NFT of an asset owns it in the blockchain sense and in most Ocean dApps will be detected as the publisher. Lawyers won't like this statement. The owner is able to define various roles within the NFT, allowing to delegate actions like updating metadata to managers.

Datatokens define the access to an asset, whoever has a datatoken can download or start a compute job on an asset. They are bound to download or compute services defined and stored within the DDO. As there can be multiple services for an asset, there can be multiple datatokens for an asset, and ultimately multiple pools for an asset. The Ocean Market UI allows only one service and one pool per asset in its first release, but forks are free to extend on that.

[kremalicious]

• mention datatoken name & symbol generation (will stay as is)
• mention NFT name & symbol generation (needs a new concept first)
• mention how we store and display asset metadata, and NFT token metadata (needs concept first, see Data NFT market#944)

[trentmc]

Hi @akshay-ap, sorry for the delay, I've now reviewed and suggested edits. Thanks!