feat: add Sepolia testnet instead of Goerli and add some features for Hardhat deploy in contracts.mdx

[0xemrekaya]

Description:
The Goerli network is deprecated, so I have made some arrangements to use the Sepolia network both Hardhat and Foundry.

• I removed all Goerli RPC urls and replaced them with Sepolia RPC urls.
• I removed all Goerli Chain IDs and replaced them with Sepolia Chain IDs.
• I added Sepolia Block Explorer instead of Goerli Block Explorer.

WHY?
I follow your documentation frequently, and I suddenly realised in your documentation you warned that "The Goerli network is deprecated, please use Sepolia instead." , so I wanted to apply this to the deployment part.

I also added some features to the deployment section with Hardhat, that part was very empty in the documentation.

• I added a Bash command on how to compile the contract.
• I added a Bash command on how to test the contract.
• I added a Bash command for both Sepolia testnet and mainnet on how to deploy the contract.

Files

• docs/zora-network/contracts.mdx

I used Hardhat and Zora as sources.

[vercel]

@0xemrekaya is attempting to deploy a commit to the Zora Team on Vercel.

A member of the Team first needs to authorize it.

[0xemrekaya]

cc: @IsabellaSmallcombe and @iainnash