chore: update golang tutorials to use v1 authored blobs

[jcstein]

these guides use v0 blobs and namespaces, but need to use v1 and authored blobs. update them:

1. golang + light node: https://docs.celestia.org/tutorials/golang-client-tutorial
2. double-check the rust + light node: https://docs.celestia.org/tutorials/rust-client-tutorial