Fix preconnect link to target search cluster

[francoischalifour]

Same as reactjs/react.dev#3980

The appId was retrieved from props but the <Search> component is never instantiated with props. So the preconnect link targeted an unknown search cluster:

<link rel="preconnect" href="https://undefined-dsn.algolia.net" crossorigin="true">

This fixes the preconnect link by getting the appId from the website config.

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