404 macaroon link

[danarchos]

Macaroon link to learn about how to bake macaroons with custom permissions leads to 404.

docs.lightning.engineering/lightning-network-tools/lnd/macaroons.md

[guggero]

It's a relative link that isn't translated correctly when synced from the lnd repo. We currently don't have the READMEs of other packages synced to the docs repo. The information is here: https://github.com/lightningnetwork/lnd/blob/master/macaroons/README.md

[carlaKC]

@ryanthegentry should we sync the lnd README so that the relative link works?
We'd need all the lnd docs to be in /docs/lnd/docs and then just the readme to be in /docs/lnd so may not be worth re-linking everything in gitbook.