fix/minor: replace backend IP with Docker service hostname (#96)

* fix/minor: replace backend IP with Docker service hostname

* remove useless nginx.conf file

* add comment into /nginx/nginx.conf

Author: eltouma

nginx.conf

@@ -6,7 +6,8 @@ events {
 
 http {
     upstream app_backend {
-        server 192.168.0.102:8080;
+        # name of container
+        server eln-community-dev:8080;
     }
 
     server {