* document use of asb export-bitcoin-wallet
Add to the `asb` document @delta1's text on exporting the Bitcoin wallet
descriptor and importing the descriptor into Sparrow Wallet.
TODO: maybe it would make sense to add the images to Git, instead of
linking to files on Github?
* bring asb/README.md into compliance with dprint
* update bullet point formatting in asb/README.md
* run
* add images to git
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Co-authored-by: icyfestive <>
Co-authored-by: Byron Hambly <byron@hambly.dev>
