fix: disable Starlight's built-in 404 rout

[Aziz-JH]

Summary

Follow-up to #264.

Starlight injects its own 404 route on top of our custom src/pages/404.astro. Setting disable404Route: true turns that off so only our page is served.

Right now it's just a router warning, but Astro will turn the collision into a hard error soon.

Validation

npm run build and npm run typecheck both pass.

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[oz-for-oss]

@Aziz-JH

Every PR must be linked to a same-repo issue before Oz can review it.

Next step: open or find a same-repo issue describing this change, then link it to this PR by adding Closes #123 to the PR description (or using the "Development" sidebar on GitHub). A maintainer will mark the issue ready-to-implement when it is ready. Once it is marked, comment /oz-review to re-trigger review.

See the contribution guidelines for the full readiness model.

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