[docs] Updated contributing guidelines

[nemesifier]

• Mention openwisp-commit tool
• Other minor details updated

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 934f0e4 and b6594a9.

📒 Files selected for processing (1)

• developer/contributing.rst

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch link-openwisp-commit-tool

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