Fix critical enhancement hanging bug caused by nil context in content injection

Replace nil context with context.Background() in content.go to prevent database operations from hanging indefinitely. Clean up outdated documentation files and add current project structure analysis.

justfile

@@ -37,8 +37,7 @@ dev: build-lib build
     echo "🌐 All sites available at:"
     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 "   Simple:        http://localhost:8080/sites/blog/"  
     echo ""
     echo "📝 Full-stack ready - edit content with real-time persistence!"
     echo "🔄 Press Ctrl+C to shutdown"