remove index.html pointer from docker nginx confs and host-your-own.md as it is unnecessary for the implemented node only solution

docker/nginx/production.conf

@@ -22,11 +22,6 @@ server {
     expires epoch;
 
     location / {
-        root   /usr/share/nginx/html;
-        index  index.html index.htm;
-    }
-
-    location /server {
         proxy_connect_timeout 300;
         proxy_pass http://node:3000;
         proxy_set_header Connection "upgrade";