Add complete documentation pages to landing page

Create professional HTML pages for all documentation sections:
- docs/quickstart.html — Installation and first extraction
- docs/overview.html — Architecture and design decisions
- docs/tutorial.html — Format-by-format walkthrough
- docs/usecases.html — Real-world integration patterns
- docs/recipes.html — Copy-paste code snippets

All pages use consistent styling with:
- Professional gradient header
- Collapsible details/summary elements for better UX
- Code examples with proper whitespace handling
- Breadcrumb navigation
- Links back to home page
- Responsive mobile design

Updated index.html to link to all new pages with correct hrefs.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: fsecada01

docs/index.html

@@ -428,23 +428,23 @@ <h3>Use the CLI</h3>
                 <h2>📚 Documentation</h2>
                 <p style="margin-bottom: 1.5rem;">Choose your path based on what you need:</p>
                 <div class="guides-grid">
-                    <a href="#" class="guide-card">
+                    <a href="quickstart.html" class="guide-card">
                         <h3>🎯 Quick Start</h3>
                         <p class="description">Install and run your first extraction in under 2 minutes.</p>
                     </a>
-                    <a href="#" class="guide-card">
+                    <a href="overview.html" class="guide-card">
                         <h3>🔍 Technical Overview</h3>
                         <p class="description">Architecture, module design, and implementation details.</p>
                     </a>
-                    <a href="#" class="guide-card">
+                    <a href="tutorial.html" class="guide-card">
                         <h3>📖 Tutorial</h3>
                         <p class="description">Format-by-format walkthrough with real examples.</p>
                     </a>
-                    <a href="#" class="guide-card">
+                    <a href="usecases.html" class="guide-card">
                         <h3>💼 Use Cases</h3>
                         <p class="description">FastAPI, S3, LangChain, batch processing patterns.</p>
                     </a>
-                    <a href="#" class="guide-card">
+                    <a href="recipes.html" class="guide-card">
                         <h3>📋 Recipes</h3>
                         <p class="description">Copy-paste snippets for common tasks.</p>
                     </a>