fix: 404 links

[youyyytrok]

Description:

This PR addresses the following issues:

• Fixed a broken link in default-config.ts related to the EthereumJS monorepo.
• Updated a broken link in the README.md for the hardhat-web3-v4 plugin documentation.

Checklist:

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

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Latest commit: 706a440

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 28, 2025 10:30am