feat: add frontend nginx image

deployment/nginx.conf

@@ -0,0 +1,21 @@
+server {
+    listen       80;
+
+    location / {
+        root   /usr/share/nginx/html;
+        index  index.html;
+        try_files $uri $uri/ /index.html;
+    }
+
+    location /api/ {
+        proxy_pass http://backend:3000;
+    }
+
+    location /socket.io/ {
+        proxy_pass http://backend:3000;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header Host $host;
+    }
+}