Fix GitHub Pages Jekyll configuration for proper theme styling

[Copilot]

Problem

GitHub Pages deployment shows broken styling with oversized logo and incorrect layout, while local Jekyll server displays correctly. This affects the user experience for visitors accessing the tutorial documentation.

Root Cause

The Jekyll configuration had two critical issues:

1. Incorrect baseurl configuration: Set to empty string "" instead of the GitHub Pages subpath
2. Theme files excluded from build: Essential theme directories were incorrectly excluded, preventing proper styling

Changes Made

Fixed baseurl and url configuration

# Before
baseurl: ""
url: "https://codinggirlsclub.github.io/ai-clacky-workshop-tutorial"

# After  
baseurl: "/ai-clacky-workshop-tutorial"
url: "https://codinggirlsclub.github.io"

Removed theme files from exclude list

# Before - incorrectly excluded theme files
exclude:
  - docs/
  - .github/
  - Gemfile
  - Gemfile.lock
  - vendor/
  - README.md
  - _includes/      # ❌ Theme essential
  - _layouts/       # ❌ Theme essential  
  - assets/css/     # ❌ Theme essential
  - assets/js/      # ❌ Theme essential

# After - only exclude non-theme files
exclude:
  - docs/
  - .github/
  - Gemfile
  - Gemfile.lock
  - vendor/
  - README.md

Expected Result

• ✅ GitHub Pages properly loads just-the-docs theme styling
• ✅ Logo displays at correct size
• ✅ Layout matches local Jekyll server appearance
• ✅ Consistent user experience across local and deployed versions

Testing

The changes follow Jekyll and GitHub Pages best practices:

• baseurl correctly handles repository subpath deployment
• url points to the base GitHub Pages domain
• Theme files are preserved for proper rendering

Fixes styling issues reported in the repository documentation.

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