Add Quokka icon and file-extension default config

[lunelson]

This PR copies the Wallaby.js icon and changes its color to the Quokka.js brand color; it also adds a config to show the Quokka icon for any files named with *.quokka.{tsx?,jsx?}

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[tj-commits]

I like that

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[lunelson]

Thanks @tj-commits and @PKief, for taking a look at this. What do you think? Are you in to merging it?

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Merge Successful

Thanks for your contribution! 🎉

The changes will be part of the upcoming update on the marketplace.