Use website branding in docs

[violet-agent]

Summary

• Replaces the docs favicon/logo assets with the favicon used by the website repo.
• Points Vocs logoUrl and iconUrl at /favicon.svg.
• Keeps the legacy /bloom-mark.svg path present with the same website favicon contents so old references do not render stale branding.
• Adds a branded public/og.png preview image containing the favicon.
• Sets docs metadata/social preview tags around /bloom | Documentation and the Bloom docs description.
• Uses the Cloudflare Pages preview URL as baseUrl on previews, and https://docs.bloom.directory on production, so metadata/assets stay absolute without breaking preview assets.
• Adds the /bloom wordmark to the first Overview page, with website-matched letter-spacing: -0.04em, and removes the redundant visible Bloom Docs heading.

Verification

• npm exec -- tsc --noEmit
• npm run build
• Browser-verified the deployed Cloudflare preview for:
  • wordmark computed letter-spacing: -0.04em
  • favicon URL resolving on the preview host
  • Open Graph/Twitter title, description, and image tags
• Verified preview assets:
  • /favicon.svg
  • /og.png

[cloudflare-workers-and-pages]

Deploying bloom-docs with    Cloudflare Pages

Latest commit:	30fe612
Status:	✅  Deploy successful!
Preview URL:	https://4cc53355.bloom-docs-ezr.pages.dev
Branch Preview URL:	https://docs-website-branding.bloom-docs-ezr.pages.dev

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