fix(website): Fix unknown chain bug in package page

[FuzzB0t]

When an unknown chain id is used in a package, we get an application error when trying to access that packages page on the web app.

Added a placeholder chain config so that when unknown chains are used, it defaults to that.

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Latest commit: 9ef2daa

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✅ Successfully ran 1 target

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

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[nicosampler]

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[saeta-eth]

i wonder if we should return a viem.Chain object here

[FuzzB0t]

I'll do that just in case, good catch :)

[saeta-eth]

Ref:

cannon/packages/cli/src/chains.ts

Line 25 in e00d869

return {