Remove hardcoded url for Upsun/Platform and replace it by the workaround method

Author: romainruaud

.platform/applications.yaml

@@ -85,7 +85,7 @@
   variables:
       env:
           NEXT_PUBLIC_API_ROUTE_PREFIX: 'api'
-          NEXT_PUBLIC_API_URL: 'https://upsun-deployment-config-3xlvpkq-kxux3rltbhsgo.fr-3.platformsh.site/api'
+#          NEXT_PUBLIC_API_URL: 'Set this as an environment variable in Platform.sh'
 
   # The size of the persistent disk of the application (in MB). Minimum value is 128.
   disk: 2048

.upsun/config.yaml

@@ -6,7 +6,7 @@ applications:
     variables:
         env:
             NEXT_PUBLIC_API_ROUTE_PREFIX: 'api'
-            NEXT_PUBLIC_API_URL: 'https://upsun-deployment-config-3xlvpkq-kxux3rltbhsgo.fr-3.platformsh.site/api'
+#            NEXT_PUBLIC_API_URL: 'Set this as an environment variable in Upsun'
     mounts:
       "/.npm":
         source: "storage"