Issue-#701: Improve v4-NFT doc

content/concepts/v4-nft.md

@@ -1,8 +1,13 @@
-### NFTS
+---
+title: v4 NFT introduction
+description: The page describes NFT, IP and sub-licensing using Ocean Protocol's contracts, and use case.
+---
+
+## NFTS
 
 A non-fungible token stored on the blockchain represents a unique asset. NFTs can represent images, videos, digital art, or any piece of information. NFTs can be traded and allow transfer of ownership and copyright. [EIP-721](https://eips.ethereum.org/EIPS/eip-721) defines an interface for handling NFTs on Ethereum blockchain. The creator of the NFT can deploy a new contract on Ethereum or any Blockchain supporting NFT related interface and also, transfer the ownership through the transaction(s).
 
-### Terminology
+## Terminology
 
 - **Base IP** means the artifact being copyrighted. Represented by the {ERC721 address, tokenId} from the publish transactions.
 
@@ -14,21 +19,21 @@ A non-fungible token stored on the blockchain represents a unique asset. NFTs ca
 
 - **To Sub-license**:Transfer one (of many) sub-licenses to new licensee: ERC20.transfer(to=licensee, value=1.0)
 
-### Supporting NFT using Ocean Protocol
+## Supporting NFT using Ocean Protocol
 
 Ocean Protocol defines [ERC721Factory](https://github.com/oceanprotocol/contracts/blob/v4main/contracts/ERC721Factory.sol) contract, allowing **Base IP holders** to create their ERC721 contract instances on any supported networks. The deployed contract stores Metadata, ownership, sub-license information, permissions. The creator of the contract can also create and mint ERC20 token instances for sub-licensing the **Base IP**.
 
-### Sub licensing the Base IP
+## Sub licensing the Base IP
 
 ERC721 tokens are non-fungible, thus cannot be used for automatic price discovery like ERC20 tokens. ERC721 and ERC20 combined together can be used for sub-licensing. Ocean Protocol's [ERC721Template](https://github.com/oceanprotocol/contracts/blob/v4main/contracts/templates/ERC721Template.sol) solves this problem by using ERC721 for tokenizing the **Base IP** and tokenizing sub-licenses by using ERC20. Thus, sub-licenses can be traded on any AMM as the underlying contract is ERC20 compliant.
 
-### Use case
+## Use case
 
 Alice is the author of a book. Alice wants to hold the copyright of her work but, allows others to read her book. So, She creates 2 versions of her book namely: digital copy, physical copy. She assigns Bob as one of the holder of digital edition of the book. Here, **Base IP** is the book. **Base IP holder** is Alice and Bob is **Sub-licensee** for a digital edition of the book. Alice tokenizes her work by performing **Publish** action i.e _ERC721.safeMint(to=aliceWalletAddress, tokenid=1)_. Alice also creates sub-licenses of her book by creating two ERC20 tokens and transefers the digital copy token to Bob's wallet.
 
 ![Image 1](images/v4-nft-1.PNG)
 
-### Other References
+## Other References
 
 - https://en.wikipedia.org/wiki/Non-fungible_token
 - https://blog.oceanprotocol.com/nfts-ip-1-practical-connections-of-erc721-with-intellectual-property-dc216aaf005d

content/concepts/v4-roles.md

@@ -1,11 +1,16 @@
-### Roles
+---
+title: v4 roles and permissions
+description: The page describes the roles and permissions present in ERC721Template contract.
+---
+
+## Roles
 
 [ERC721Template](https://github.com/oceanprotocol/contracts/blob/v4Hardhat/contracts/templates/ERC721Template.sol) contract defines following roles:
 
 - NFT Owner
 - Manager
 
-#### NFT Owner
+## NFT Owner
 
 - NFT Owner is the publisher. I.e. Owner is a public address which transacted with `ERC721Factory` contract and deployed a new `ERC721` contract.
 
@@ -14,7 +19,7 @@
 - NFT Owner can add/remove Managers.
 - Clean all permissions
 
-#### Manager
+## Manager
 
 - A public address with a `Magner` role can update the metadata
 - Can deploy new ERC20 contract which is associtated with the `ERC721` contract.

data/sidebars/concepts.yml

@@ -25,7 +25,7 @@
     - title: DDO Metadata
       link: /concepts/ddo-metadata/
 
-- group: NFTs
+- group: NFTs (upcoming v4 release)
   items:
     - title: Introduction
       link: /concepts/v4-nft/