fix: Nginx experiment now working with docker run

- docker-compose has networking issues on macOS
- docker run works perfectly with --add-host flag
- Added start-nginx-experiment.sh script for easy setup
- All tests passing: redirects, static assets, main app

The Nginx reverse proxy path rewriting is now fully working!

Author: Yukaii

start-nginx-experiment.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+
+# Start Nginx reverse proxy experiment (using docker run instead of docker-compose)
+# docker-compose has networking issues on macOS, but docker run works perfectly
+
+echo "🐳 Starting Nginx Reverse Proxy Experiment"
+echo "==========================================="
+echo
+
+# Stop any existing container
+if docker ps -a | grep -q nginx-codimd-experiment; then
+    echo "Stopping existing Nginx container..."
+    docker stop nginx-codimd-experiment 2>/dev/null
+    docker rm nginx-codimd-experiment 2>/dev/null
+fi
+
+# Start Nginx with docker run (works on macOS)
+echo "Starting Nginx container..."
+docker run -d \
+    --name nginx-codimd-experiment \
+    -p 8081:8081 \
+    -v "$(pwd)/nginx.experiment.conf:/etc/nginx/conf.d/default.conf:ro" \
+    --add-host=host.docker.internal:host-gateway \
+    nginx:alpine
+
+if [ $? -eq 0 ]; then
+    echo "✅ Nginx container started successfully!"
+    echo
+    echo "Waiting for Nginx to be ready..."
+    sleep 2
+    
+    # Test the setup
+    echo
+    echo "Testing Nginx setup:"
+    echo "-------------------"
+    
+    echo -n "1. Root redirect: "
+    if curl -s -I http://localhost:8081/ --max-time 2 | grep -q "301"; then
+        echo "✅ Working"
+    else
+        echo "❌ Failed"
+    fi
+    
+    echo -n "2. Main app (/codimd/): "
+    if curl -s -I http://localhost:8081/codimd/ --max-time 2 | grep -q "200"; then
+        echo "✅ Working"
+    else
+        echo "❌ Failed"
+    fi
+    
+    echo -n "3. Static assets: "
+    if curl -s -I http://localhost:8081/codimd/favicon.png --max-time 2 | grep -q "200"; then
+        echo "✅ Working"
+    else
+        echo "❌ Failed"
+    fi
+    
+    echo
+    echo "=========================================="
+    echo "✨ Nginx reverse proxy is running!"
+    echo
+    echo "Access the app at: http://localhost:8081/codimd/"
+    echo
+    echo "Useful commands:"
+    echo "  - View logs: docker logs -f nginx-codimd-experiment"
+    echo "  - Stop: docker stop nginx-codimd-experiment"
+    echo "  - Remove: docker rm nginx-codimd-experiment"
+    echo
+else
+    echo "❌ Failed to start Nginx container"
+    exit 1
+fi