Update Dockerfile and nginx.conf for Dokploy deployment

nginx.conf

@@ -0,0 +1,18 @@
+events {}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    server {
+        listen 80;
+        server_name localhost;
+
+        location / {
+            root   /usr/share/nginx/html;
+            index  index.html index.htm;
+            # This line forces Nginx to pass routing back to React Router
+            try_files $uri $uri/ /index.html;
+        }
+    }
+}