migrate from Cloudinary to AWS S3

[autoboxer]

As a shareholder, I need to migrate our image service to an AWS S3 instance so that we can reduce the cost of the site.

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tasks

• set up S3 buckets for development, staging, and production
• set up https and encryption for the S3 buckets
• set up security policies restricting access to only calls from the site
• set up Cloudfront for image cacheing and CDN
• migrate all images to the S3 buckets
• update all admin UI fields to use the file type and point to the new image locations
• update the admin UI to provide an image preview
• turn off Cloudinary service through Cloudinary
• remove Cloudinary setup and config from the application

related issues

#52