Fix fallback dev search

[ia3andy]

This in combination with https://github.com/quarkusio/search.quarkus.io/pull/238 should fix the local dev search issue.

The idea is to use the production search script and host by default in dev. Using it will result in a 403 leading to using the local search fallback.

[ia3andy]

cc @gsmet @yrodiere @marko-bekhta

[github-actions[bot]]

🎊 PR Preview 661f2f5a60f92d8d9c2ec5830b84ece6f422be52 has been successfully built and deployed to https://quarkus-site-pr-1944-preview.surge.sh

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[yrodiere]

@ia3andy Can't you just use staging, since prod will always fail due to CORS?

See https://github.com/quarkusio/search.quarkus.io?tab=readme-ov-file#current-process

[ia3andy]

@yrodiere I also get CORS on staging

[yrodiere]

merged, thanks