feat: return markdown when accept header is not text/html

[marcklingen]

Important

Serve markdown files based on Accept header and add relevant headers and rewrites in next.config.mjs.

• Behavior:
  • Serve markdown files when Accept header requests markdown and not HTML in next.config.mjs.
  • Add Vary: Accept header to paths that might serve different content based on Accept header, excluding /api and /_next routes.
• Headers:
  • Add X-Robots-Tag: noindex and Content-Type: text/markdown; charset=utf-8 to /md-src/:path*.md in next.config.mjs.
• Rewrites:
  • Add rewrite rule to serve markdown for paths without file extensions when Accept header requests markdown in next.config.mjs.

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Project	Deployment	Preview	Updated (UTC)
langfuse-docs	Ready	Preview	Sep 29, 2025 9:51pm