The rebuilt-site cutover dropped several `next.config.ts` blocks the
previous twenty-website had:
- **`deploymentId`** — required by `open-next.config` skew protection;
deploys were failing with *"Deployment ID should be set in the Next
config when skew protection is enabled"*.
- **Security headers** (HSTS, CSP `frame-ancestors`, X-Frame-Options, …)
+ immutable asset `Cache-Control`.
- **Redirects** — www→apex canonicalization and content redirects (docs,
legal, case-studies, partners, why-twenty).
Legacy raw locale-code redirects were intentionally not restored (the
site only serves en/fr/es; those URLs never existed for other locales).
Pairs with twentyhq/twenty-infra#741, which builds twenty-ui before the
worker build.
Abdullah.
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