chore: update in-repo references after repo rename to ai-workflow-course

Gitea repo renamed the-workflow-course -> ai-workflow-course. Update the two
references to the old slug/URL:
- README repo-layout tree root.
- Module 1 "Get the course materials" download URL (still Verify-before-publish
  for the eventual public/GitHub host).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TfzV5QvtPDz8LJS3Pu5VLT

modules/01-the-copy-paste-problem/README.md

@@ -148,7 +148,7 @@ purpose** so you recognize it later.
 Everything you'll run in this course lives in one repo. Grab it once, up front — no tools required
 beyond a web browser:
 
-1. Open the course's home page — **`https://git.jpaul.io/justin/the-workflow-course`** — and use its
+1. Open the course's home page — **`https://git.jpaul.io/justin/ai-workflow-course`** — and use its
    **Download ZIP** (archive) link.
 2. Unzip it under your home directory so the course's `modules/` folder lands at
    `~/workflow-course/modules/`. (Rename the unzipped folder to `workflow-course` if your download