Adds lightning-transaction-sync in favor of Confirm

[ConorOkus]

Can add examples for kotlin and swift examples once exposed in the bindings.

Also probably worth adding CBF examples once available in BDK 1.0

Closes https://github.com/lightningdevkit/lightningdevkit.org/issues/249

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[ConorOkus]

Basically LGTM.

Not sure if we want to hold off merging this until the next bindings release to immediately include the tx-sync examples?

Yeah let's hold off for that, sgtm!