feat: deploy demo swap contract to arb-sepolia

[adamegyed]

Also saves some deploy script guide to the README in examples/ui-demo/contracts/.

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

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PR-Codex overview

This PR updates the deployment process and verification instructions for Swap and ERC20Mintable contracts in the README.md and adds transaction details in the DeploySwapVenue.s.sol JSON file.

Detailed summary

• Updated script command in README.md for deploying Swap with DeploySwapVenue.s.sol.
• Added instructions for verifying contracts with ETHERSCAN_API_KEY.
• Included transaction details for the deployment of Swap and ERC20Mintable contracts in the JSON file.

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 18, 2025 11:46pm
aa-sdk-ui-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 18, 2025 11:46pm

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