Decouple from Amazon

[Roznoshchik]

For storing image content the app currently sends images to amazon s3. This is fine for the web-app version, but if the app is meant to run locally, then it's not necessary.

There should be a flag somewhere to determine if this is supposed to be a web app or an offline app and removes the Amazon dependency if that's the case.

[Roznoshchik]

Think this can likely be solved by doing the following.

1. Adding an env variable such as UPLOAD_IMAGES=1
2. Keeping the upload to Amazon code behind an if os.environ.get('UPLOAD_IMAGES'):
3. changing img src to point to the on disk location of the saved images.