Well I checked and made necessary changes your site .
I am seeing content in your site in my ionic setup .
now its all ok from server and api end .
Please check your app now .If still issue is appearing then it must be something in your app code or in something in your ionic setup itself.
Please try replacing your config.xml file in your ionic setup root (where src,resources folders are) with this one : https://bit.ly/2GJQDxO