make the docker build actually working

client/Dockerfile

@@ -1,3 +1,3 @@
 FROM nginx:alpine
 COPY ./build /usr/share/nginx/html
-COPY ./api.conf /etc/nginx/conf.d/
+COPY ./api.conf /etc/nginx/conf.d/default.conf

client/api.conf

@@ -1,11 +1,19 @@
 server {
-  location /api/ {
+  listen 80;
+
+  location / {
+    root   /usr/share/nginx/html;
+    index  index.html index.htm;
+  }
+
+  # redirect server error pages to the static page /50x.html
+  #
+  error_page   500 502 503 504  /50x.html;
+  location = /50x.html {
+    root   /usr/share/nginx/html;
+  }
+
+  location /api {
       proxy_pass  http://backend:5000;
-      proxy_redirect default;
-
-      proxy_read_timeout 241s;
-
-      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-      proxy_set_header X-Forwarded-Proto $scheme;
   }
 }