Hardcode proxy URLs in nginx config

Replace environment variables with hardcoded URLs to postguard-main.cs.ru.nl for both pkg and irma endpoints.

Author: rubenhensen

docker/nginx.conf

@@ -89,11 +89,11 @@ http {
         }
 
         location /pkg/ {
-            proxy_pass http://${PKG_URL}:${PKG_PORT}/;
+            proxy_pass https://postguard-main.cs.ru.nl/pkg/;
         }
 
         location /irma/ {
-            proxy_pass http://${IRMA_URL}:${IRMA_PORT}/irma/;
+            proxy_pass https://postguard-main.cs.ru.nl/irma/;
         }
    }
 }