#14 Resolves "Connect media uploads to S3 bucket"

Closes #33 (closed)

Notes:

Connects the database files to AWS S3 storage to make sure the files persit longer than 30 mins or through a deployment to heroku. Done using another Django model of UploadedFile in a supporting branch in core-be.

Requires 3 new variables in secrets.json which have matching definitions in the pipeline variables.

Currently connected to my AWS account so we will have to get YES to set up one so we can make sure they are happy and we aren't paying for it.

Reason for choosing AWS is noted in the attached issue.