Link NetBird Linux install docs

[jnfrati]

Description

• Point Ubuntu/Debian install instructions to the NetBird apt repository setup docs
• Point Fedora/RHEL install instructions to the NetBird dnf repository setup docs

Validation

• Documentation-only change

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3ffd397c-824c-417e-89d4-aa8da8d04c6a

📥 Commits

Reviewing files that changed from the base of the PR and between f3dba5d and 954d351.

📒 Files selected for processing (3)

• CONTRIBUTING.md
• README.md
• docs/d-bus-security-model.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/link-netbird-linux-install

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