Add share cards to website-next

[tobias-tengler]

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[Copilot]

Pull request overview

This PR adds Open Graph share-card generation for website-next, including default marketing cards and per-doc cards for static export.

Changes:

• Adds shared OG card rendering, vendored Inter fonts, and mirrored color tokens for Satori.
• Adds docs OG image routes and metadata wiring for docs/blog pages.
• Updates nginx caching behavior for generated OG images.

Reviewed changes

Copilot reviewed 12 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
website-next/src/theme/colors.ts	Adds mirrored theme color constants for OG rendering.
website-next/src/og/ShareCard.tsx	Adds the shared share-card React layout.
website-next/src/og/fonts/LICENSE.md	Documents vendored Inter font licensing/source.
website-next/src/og/fonts.ts	Adds font loading for ImageResponse.
website-next/src/helpers/siteUrl.ts	Adds helper for absolute metadata URLs.
website-next/src/helpers/docsParams.ts	Extracts docs slug enumeration/encoding helpers.
website-next/nginx/conf.d/default.conf	Adds OG image caching, but removes existing security headers.
website-next/app/globals.css	Notes color token mirroring for OG cards.
website-next/app/docs/[...slug]/page.tsx	Adds docs OG/Twitter metadata and uses shared docs params helpers.
website-next/app/docs-og/[id]/opengraph-image.tsx	Adds per-doc OG image generation route.
website-next/app/blog/[...slug]/page.tsx	Adds blog OG/Twitter metadata using featured images.
website-next/app/(content)/opengraph-image.tsx	Adds default marketing OG image generation route.

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