remove unused nginx config

frontend/conf/nginx.conf

@@ -1,22 +0,0 @@
-events {
-    worker_connections  1024;
-}
-
-http {
-    server {
-        listen 8000 default_server;
-        listen [::]:8000 default_server;
-
-        root /app;
-        index index.html;
-        server_name _;
-
-        location / {
-            try_files $uri $uri/ =404;
-        }
-
-        location /api {
-            proxy_pass http://backend:8000/;
-        }
-    }
-}