Migrate to Chi router and add Norwegian Devigo demo

Major improvements:
- Replace Gorilla Mux with Chi v5 router for better performance and cleaner code
- Fix CSS/JS MIME type issues that prevented proper asset loading
- Add built-in CORS middleware replacing manual OPTIONS handlers
- Simplify routing with nested route syntax
- Update URL parameter extraction from mux.Vars to chi.URLParam

New Devigo demo:
- Add production Norwegian sales training website (devigo.no)
- Real-world Hugo-generated content with TailwindCSS
- 39 insertr-enhanced elements for comprehensive CMS testing
- Demonstrates international language support and B2B use cases
- Fixed asset paths for localhost serving compatibility

Technical benefits:
- Automatic MIME type detection for static files
- Reduced code complexity with built-in middleware
- Better performance with lighter dependency stack
- Production-ready CORS handling

justfile

@@ -40,9 +40,10 @@ dev: build-lib build
     
     echo ""
     echo "🌐 All sites available at:"
-    echo "   Default site:  http://localhost:8080/sites/default/"
-    echo "   Simple site:   http://localhost:8080/sites/simple/"  
-    echo "   Dan Eden site: http://localhost:8080/sites/dan-eden-portfolio/"
+    echo "   Default:       http://localhost:8080/sites/default/"
+    echo "   Simple:        http://localhost:8080/sites/simple/"  
+    echo "   Dan Eden:      http://localhost:8080/sites/dan-eden-portfolio/"
+    echo "   Devigo (NO):   http://localhost:8080/sites/devigo-web/"
     echo ""
     echo "📝 Full-stack ready - edit content with real-time persistence!"
     echo "🔄 Press Ctrl+C to shutdown"
@@ -62,15 +63,7 @@ dev-about: build-lib build
 check:
     npm run check
 
-# Simple demo launcher - all sites now served from main server
-demo:
-    @echo "🌐 All demo sites are served from the main server:"
-    @echo "   http://localhost:8080/sites/default/  - Main demo site"
-    @echo "   http://localhost:8080/sites/simple/   - Simple test site"  
-    @echo "   http://localhost:8080/sites/dan-eden-portfolio/ - Dan Eden portfolio"
-    @echo ""
-    @echo "🚀 To start the development server:"
-    @echo "   just dev"
+
 
 # Build the entire project (library + unified binary)
 build:
@@ -100,7 +93,9 @@ help:
 
 # Enhance demo site (build-time content injection)
 enhance input="demos/default" output="dist":
-    ./insertr enhance {{input}} --output {{output}} --mock
+    ./insertr enhance {{input}} --output {{output}}
+
+
 
 # === Content API Server Commands ===
 
@@ -157,12 +152,11 @@ status:
     @ls -la lib/package.json lib/src lib/dist 2>/dev/null || echo "   Missing library components"
     @echo "\n🔧 Unified binary:"
     @ls -la insertr main.go cmd/ internal/ 2>/dev/null || echo "   Missing unified binary components"
-    @echo "\n🌐 Demo site:"
-    @ls -la demos/demo-site/index.html demos/demo-site/about.html 2>/dev/null || echo "   Missing demo files"
+    @echo "\n🌐 Demo sites:"
+    @ls -la demos/default/index.html demos/simple/index.html demos/dan-eden-portfolio/index.html demos/devigo-web/index.html 2>/dev/null || echo "   Some demo files missing"
     @echo ""
     @echo "🚀 Development Commands:"
     @echo "   just dev             - Full-stack development (recommended)"
-    @echo "   just demo            - Show available demo sites"
     @echo "   just serve           - API server only (localhost:8080)"
     @echo "   just enhance         - Build-time content injection"
     @echo ""
@@ -201,6 +195,11 @@ clean-demos:
         echo "🗑️  Removed: dan-eden-portfolio_enhanced"
     fi
     
+    if [ -d "./demos/devigo-web_enhanced" ]; then
+        rm -rf "./demos/devigo-web_enhanced"
+        echo "🗑️  Removed: devigo-web_enhanced"
+    fi
+    
     # Clean up any temporary directories
     if [ -d "./demos/dan-eden-portfolio-temp" ]; then
         rm -rf "./demos/dan-eden-portfolio-temp"