chore(docs): restore original image paths but change baseurl _config.yml configuration

[maarten1C96]

• Restored image paths in documentation back to original links (/images), reversing the application of {{ site.baseurl }}. Although Jekyll should be able to process {{ site.baseurl }} into working images in GitHub Pages, the GitHub web interface apparently is not able to handle this.
• Path evolution for clarity:
  • Original: /images
  • Attempt 1: /../../images
  • Attempt 2: {{ site.baseurl }}/images
  • This commit: /images
• Added baseurl: "/zephyr-rtos-tutorial" in _config.yml. Maybe having this line in the configuration file will already be able to solve the incorrect image paths in Jekyll. Fingers crossed...