Migrate user-attachments images to local repository with relative paths (#64)

* Initial plan

* Migrate user-attachments images to local repository and update start-exercise to v0.8.0

Co-authored-by: FidelusAleksander <63016446+FidelusAleksander@users.noreply.github.com>

* fix: alt image description

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update start-exercise to v0.8.1 and checkout main branch explicitly

Co-authored-by: FidelusAleksander <63016446+FidelusAleksander@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: FidelusAleksander <63016446+FidelusAleksander@users.noreply.github.com>
Co-authored-by: Christopher W. Blake <chriswblake@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: 4 people

.github/images/dadjoke-mona.png

@@ -6,7 +6,7 @@ Maybe that’s because your task is a bit _too_ unique 😆
 
 **GENERATING DAD JOKES**! 🎭
 
-<img width="600" alt="dadjoke-mona" src="https://github.com/user-attachments/assets/46b6b931-8d1f-4a01-88f4-4568704039a0" />
+<img width="600" alt="dadjoke-mona" src="../images/dadjoke-mona.png" />
 
 Since no pre-built action exists for your quirky automation needs, it's time to roll up your sleeves and create your own!
 

.github/images/joke-action-workflow-run.png

@@ -10,7 +10,7 @@ The only thing left to do is test it out!
 
 1. Monitor the **Actions** tab for the `Joke Action` workflow to complete:
 
-   <img width="400" alt="SCR-20251113-kntg" src="https://github.com/user-attachments/assets/992da295-0123-4688-a068-d289967f2455" />
+   <img width="400" alt="Screenshot of the Joke Action workflow run showing a successful completion" src="../images/joke-action-workflow-run.png" />
 
 
 1. Return to the issue and you should see a new comment posted by `github-actions[bot]` containing a random dad joke!

.github/steps/1-step.md

@@ -19,7 +19,7 @@ jobs:
     if: |
       !github.event.repository.is_template
     name: Start Exercise
-    uses: skills/exercise-toolkit/.github/workflows/start-exercise.yml@v0.7.3
+    uses: skills/exercise-toolkit/.github/workflows/start-exercise.yml@v0.8.1
     with:
       exercise-title: "Write JavaScript Actions"
       intro-message: "Learn to create and use custom JavaScript actions in your GitHub workflows"
@@ -35,6 +35,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v5
+        with:
+          ref: main
 
       - name: Get response templates
         uses: actions/checkout@v5