chore: update the CONTRIBUTING.md with shared content

[holochain-release-automation2]

This PR updates the CONTRIBUTING.md file with the content from the shared file in the hc-github-config repo.

[cocogitto-bot]

✔️ 788d4d8 - Conventional commits check succeeded.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b1c236d2-b50d-4e2a-ba96-2e007aa8aa1b

📥 Commits

Reviewing files that changed from the base of the PR and between 31e22c7 and 788d4d8.

📒 Files selected for processing (1)

• CONTRIBUTING.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/update-contributing-guide

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