L402 external macaroon reference link broken.

[ZZiigguurraatt]

Link to https://hackingdistributed.com/2014/05/21/my-first-macaroon/ at

docs.lightning.engineering/the-lightning-network/l402/macaroons.md

Line 39 in fb607ef

[Also read: Hacking Distributed: My first Macaroon](https://hackingdistributed.com/2014/05/21/my-first-macaroon/)

is broken. Suggest referencing https://web.archive.org/web/20240702142618/https://hackingdistributed.com/2014/05/21/my-first-macaroon/ instead, removing the link altogether, or referencing a different source instead.

[Liongrass]

Ah that's a shame. I've removed the link entirely