Add GitHub Pages configuration for online book

Complete GitHub Pages setup with Jekyll to serve the book as a
beautiful, navigable website.

New files:
- _config.yml: Jekyll configuration with Cayman theme
- index.html: Beautiful landing page with book overview
- assets/css/style.scss: Custom styling for better readability
- .github/workflows/pages.yml: Automated deployment workflow
- Gemfile: Ruby dependencies for Jekyll
- GITHUB_PAGES_SETUP.md: Complete setup and maintenance guide

Features:
- Responsive design (mobile-friendly)
- Syntax highlighting for Smalltalk code
- Chapter navigation throughout
- SEO optimization
- Automatic deployment on push
- Print-friendly styles
- Custom typography for readability

The book will be available at:
https://cloudstreet-dev.github.io/Learn-Programming-with-Smalltalk/

Next step: Enable GitHub Pages in repository settings.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: DavidLiedle

.github/workflows/pages.yml

@@ -0,0 +1,61 @@
+# GitHub Pages deployment workflow
+name: Deploy Jekyll site to Pages
+
+on:
+  # Runs on pushes targeting the default branch
+  push:
+    branches: ["main"]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.1'
+          bundler-cache: true
+          cache-version: 0
+
+      - name: Setup Pages
+        id: pages
+        uses: actions/configure-pages@v4
+
+      - name: Build with Jekyll
+        run: bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
+        env:
+          JEKYLL_ENV: production
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+
+  # Deployment job
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

@@ -1 +1,13 @@
 link_check_report.md
+
+# Jekyll
+_site/
+.sass-cache/
+.jekyll-cache/
+.jekyll-metadata
+vendor/
+
+# Ruby
+Gemfile.lock
+*.gem
+.bundle/