feat: add Super Mango favicon assets

[jonathanperis]

Summary

• add a dark arcade/pixel-art Super Mango favicon set (favicon.ico, PNG fallback, 32px PNG, Apple touch icon)
• wire Astro head links with the GitHub Pages base path so icon URLs resolve under /super-mango-editor/
• include a deterministic Pillow generator for future favicon refreshes

Test Plan

• git diff --check
• python3 scripts/generate_favicon.py
• Pillow verification of ICO embedded sizes: 16, 24, 32, 48, 64, 128, 256
• bun run build in docs/
• generated HTML contains base-aware icon links
• built icon assets exist with expected dimensions and non-trivial sizes
• bun run lint in docs/

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 2e092fd8-2cfb-4eee-9492-f6469d557c08

📥 Commits

Reviewing files that changed from the base of the PR and between 8d7aa58 and 93f63b0.

⛔ Files ignored due to path filters (4)

• docs/public/apple-touch-icon.png is excluded by !**/*.png
• docs/public/favicon-32x32.png is excluded by !**/*.png
• docs/public/favicon.ico is excluded by !**/*.ico
• docs/public/favicon.png is excluded by !**/*.png

📒 Files selected for processing (2)

• docs/src/layouts/BaseLayout.astro
• scripts/generate_favicon.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/site-favicon

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