docs: add social preview image

[jonathanperis]

Summary

• Add a 1200x630 social preview image that matches the existing dark cyan/purple .NET topology favicon and GitHub Pages aesthetic.
• Add favicon PNG, 32x32 PNG, and Apple touch icon fallbacks derived from the existing favicon.ico.
• Wire base-aware Open Graph/Twitter image metadata plus richer icon links in the Astro layout.

Test Plan

• python/Pillow asset dimension and ICO frame assertions
• git diff --check
• dotnet restore src/WebApi/WebApi.csproj -p:Configuration=Release -p:AOT=true -p:Trim=false
• dotnet build src/WebApi/WebApi.csproj -c Release --no-restore -p:AOT=true -p:Trim=false -p:ExtraOptimize=true
• cd docs && bun install --frozen-lockfile
• cd docs && NODE_ENV=production bun run build
• cd docs && bun run lint
• Generated HTML assertions for base-aware icon links and og:image/twitter:image

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 07b6143b-f9ab-43bf-9906-c559e9cbe55d

📥 Commits

Reviewing files that changed from the base of the PR and between ee12b1f and 70c6d2c.

⛔ 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.png is excluded by !**/*.png
• docs/public/social-preview.png is excluded by !**/*.png

📒 Files selected for processing (1)

• docs/src/layouts/BaseLayout.astro

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/add-social-preview-image

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