Dockerfile and nginx.conf changes for tutorials

nginx.conf

@@ -20,6 +20,12 @@ server {
         index index.html;
     }
 
+    # Explicit location for /tutorials/
+    location /tutorials/ {
+        root /usr/share/nginx/html;
+        index index.html;
+    }
+
     # Optional: serve static assets (CSS, JS, images)
     location / {
         try_files $uri $uri/ /index.html;