Remove no-store from Cache-Control

[huntharo]

• no-store is not necessary and makes things worse for browsers (file must be stored in memory)
  • This is not really necessary as this only applies to iframe which isn't really used anymore
• Details on CloudFront cache prevention / control by origin: https://aws.amazon.com/premiumsupport/knowledge-center/prevent-cloudfront-from-caching-files/