Orphaned "##" heading in docs/00-pre-workshop-setup.md — remove or fix

In docs/00-pre-workshop-setup.md there is an orphaned '##' on or near line 169 that produces an empty heading and disrupts document flow. Please remove the stray '##' or replace it with the intended heading text.

Suggested fix: delete the line containing only '##' or add the missing heading text.,