Adapt docker-compose and nginx.conf for deployment on infra

frontend/nginx.conf

@@ -5,7 +5,7 @@ server {
 
     # Proxy API calls to Django
     location /api/ {
-        proxy_pass http://web:8000;
+        proxy_pass http://app:8000;
         proxy_set_header Host web;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -14,7 +14,7 @@ server {
 
     # Proxy media files to Django
     location /media/ {
-        proxy_pass http://web:8000;
+        proxy_pass http://app:8000;
         proxy_set_header Host web;
     }