Update 'Writing Transactions to a Ledger for an Un-privileged Author.md' to use Aries-VCR

Update the instructions in Writing Transactions to a Ledger for an Un-privileged Author to use [aries-vcr](https://github.com/bcgov/aries-vcr).

The instructions currently use [TheOrgBook](https://github.com/bcgov/TheOrgBook) which has been replaced by [aries-vcr](https://github.com/bcgov/aries-vcr) and retired.

The same basic processes apply to [aries-vcr](https://github.com/bcgov/aries-vcr), and [aries-vcr-issuer-controller](https://github.com/bcgov/aries-vcr-issuer-controller).

Open the “Writing Transactions to a Ledger for an Un-privileged Author.md” document and identify its current TheOrgBook instructions. Compare the corresponding process for aries-vcr and aries-vcr-issuer-controller, then update the document so it no longer relies on the retired project. Done means the instructions consistently use the replacement projects.

Written by the indexing model from the issue text.