🔧 (docs): Update Hygen documentation link in README

[pdeville-ledger]

📝 Description

The Hygen website (www.hygen.io) appears to be either no longer working or now points to something unrelated. To ensure users can still access relevant information, this PR updates the link to redirect to the official GitHub repository instead.### ✅ Checklist

Pull Requests must pass CI checks and undergo code review. Set the PR as Draft if it is not yet ready for review.

• Covered by automatic tests
• Changeset is provided
• Documentation is up-to-date
• Impact of the changes:
  • list of the changes

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.

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[Copilot]

Pull Request Overview

This PR updates the Hygen documentation link in the README to redirect users to the official GitHub repository instead of the outdated website.

• Updated the documentation link in the README.
• Clarified access to the Hygen repository for users.