chore: swap ko-fi button for markdown GitHub-style variant

[erwan-joly]

Replaces the legacy ko-fi HTML button with the official ko-fi.com/img/githubbutton_sm.svg markdown image so all NosCore repos render the same GitHub-style sponsorship row.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Run ID: 6ed5f283-a123-46fd-95e1-37011c2fb8e0

📥 Commits

Reviewing files that changed from the base of the PR and between 324892f and 39ac366.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/kofi-button-update

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