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[theomart77]

Add mainnet transport configuration for Infura.

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• If this PR updates or adds documentation content that changes or adds technical meaning, it has received an approval from an engineer or DevRel from the relevant team.
• If this PR updates or adds documentation content, it has received an approval from a technical writer.

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• I've read the contribution guidelines.
• I've created a new issue (or assigned myself to an existing issue) describing what this PR addresses.

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Note

Adds Infura-based RPC transports for mainnet and sepolia to the JavaScript + Wagmi quickstart configuration.

• Docs (JavaScript + Wagmi quickstart):
  • Add transports example using Infura endpoints for mainnet and sepolia in sdk/connect/javascript-wagmi.md.

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