feat(website): add selector tooltip

[noahlitvin]

Maybe we right justify it with gray.400 small text so you can ctrl+f for them instead

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• lerna run build --ignore cannon-website --ignore @usecannon/indexer --ignore repo --ignore @usecannon/api

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[dbeal-eth]

does toFunctionSignature need ot happen before toFunctionSelector? I don't think its necessary, but please check.