Replace course image with updated screenshot

Updated the course image with a new screenshot and adjusted its dimensions.

Author: arnodelorme

workshops/create_your_own_course.md

@@ -5,7 +5,7 @@ long_title: Create your own course
 parent: Workshops
 nav_order: 1
 ---
-<img width="200" align="right"  alt="classroom" src="https://github.com/user-attachments/assets/61801614-5271-494d-a3b8-aaed15f10f57" />
+<img width="220" height="221" style="padding:20px;" alt="Screenshot 2025-11-16 at 15 52 35" src="https://github.com/user-attachments/assets/7debac9b-c9dc-4d62-a5fe-a78e8e74899d" />
 
 # Create Your Own EEG Course