fix(website): run worker before assets

Summary

• Default Cloudflare behavior with assets + main is asset-first: static files are served before the Worker runs, which silently bypasses the content negotiation, Content-Signal header, and Link header.
• Setting assets.run_worker_first: true makes the Worker handle every request and delegate to env.ASSETS.fetch() for static files.

Testing

• Verified against the first live deploy (https://fabrik-website.tuist-cc0.workers.dev): Accept: text/markdown returned HTML, and HTML responses had no Content-Signal/Link headers.
• After this change deploys, the Worker should intercept every request and emit the discovery headers + serve Markdown alternates when negotiated.

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