fix(website): add custom default rpcs

[mjlescano]

This PR adds the possibility for changing the default rpcs given by viem. In our case this is necessary because we've been seeing that the default Sepolia rpc does not work properly for the users on the website.

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Latest commit: 804e935

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[nicosampler]

is there a reason why we don't update the default viem transport instead?

const client = createPublicClient({ 
  chain: mainnet, 
  transport: http(), // <-- here
}) 

[mjlescano]

Because that one is only used for the registry and it is for ETH Mainnet (which is working properly). I modified only the Sepolia default rpc, which is used in Interact and Deploy, and because of the way i did it, the user can still use their custom rpc on the settings and it will be overriden.