Add token logos

[JayJay1024]

PR-Codex overview

This PR updates token images in the assets folder.

Detailed summary

• Updated dai.png, avax.png, link.png, wbtc.png token images
• Renamed usdc.e.png token image to usdc.png

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Latest commit: b39825ebd7a47f76e20781e0bb9c9e9456846c2b

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