Replace Core-Monitor branding with new icon

[offyotto]

Summary

• replace the complete macOS AppIcon asset set with the new Core-Monitor mark
• update the GitHub Pages/site logo and favicon
• keep existing README/site references intact so they pick up the new branding everywhere
• normalize the supplied exports to exact macOS icon dimensions

No product UI or unrelated code changes.

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[gitar-bot]

Code Review ✅ Approved

Replaces Core-Monitor branding with new icon across macOS app assets, GitHub Pages logo, and favicon, with all exports normalized to exact macOS dimensions. No issues found.

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