chore(website): replace useCannonRegistry hook with CannonRegistryProvider

[nicosampler]

The useCannonRegistry hook is utilized by useCannonBuild and useCannonPackage, which are hooks used in many components. Previously, each component that consumed one of these hooks would trigger the creation of provider instances for all chains. This refactor ensures that these instances are created only once when the dApp is initialized.

Ideally, we should identify all top-level components using the hook and register the provider at the highest appropriate level. However, given the widespread use of these hooks, defining it on the _app.ts file seems temporarily a valid option.

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Latest commit: ee2fa0abaa937b8c91bac9cf1f8862b18f3dc56f

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