chore: remove thirdweb rpc endpoints

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What does this PR do?

🤖 Generated by Copilot at 935ddc8

Updated RPC providers for Polygon, Mumbai and Ethereum networks in getRpc.ts. This improves the RPC calls for the Lenster app.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at 935ddc8

• Switch to publicnode.com as the primary RPC provider for Polygon, Mumbai and Ethereum networks (link, ). This improves the reliability and performance of the RPC calls for the Lenster app.

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