Display token images for BRC-20 tokens

[markmhendrickson]

It'd be better to show images specific to BRC-20 tokens for the instead of the standard red BRC-20 icon we have now.

ALEX has these on their BRC-20 marketplace and may be able to provide an API for them.

[zhigang1992]

We now have

https://token-images.alexlab.co/brc20-piza

where you can replace the brc20-piza with any token that we deploy under

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