Add comprehensive blog demo showcasing advanced content management features

- Implement complete mushroom foraging blog with chanterelles article
- Add rich demonstration of .insertr and .insertr-add functionality
- Include comprehensive documentation for future .insertr-content vision
- Update project styling and configuration to support blog demo
- Enhance engine and API handlers for improved content management

justfile

@@ -15,11 +15,6 @@ dev: build-lib build
     #!/usr/bin/env bash
     echo "🚀 Starting Full-Stack Insertr Development..."
     echo "================================================"
-    echo ""
-    
-    # Note: Sites are auto-enhanced by the server on startup
-    
-    echo ""
     echo "🔌 Starting Insertr server with all sites..."
     echo ""
     
@@ -77,10 +72,6 @@ build-lib:
 watch:
     cd lib && npm run dev
 
-# Start Air hot-reload for unified binary development
-air:
-    air
-
 # Build unified binary only
 build-insertr:
     go build -o insertr .
@@ -167,12 +158,6 @@ status:
 sqlc:
     sqlc generate
 
-
-
-
-
-
-
 # Clean generated demo directories
 clean-demos:
     #!/usr/bin/env bash
@@ -185,6 +170,11 @@ clean-demos:
         echo "🗑️  Removed: default_enhanced"
     fi
     
+    if [ -d "./demos/blog_enhanced/" ]; then
+        rm -rf "./demos/blog_enhanced/"
+        echo "🗑️  Removed: blog_enhanced"
+    fi
+    
     if [ -d "./demos/simple_enhanced" ]; then
         rm -rf "./demos/simple_enhanced"
         echo "🗑️  Removed: simple_enhanced"