Handle images using s3

[4slimbu]

Instead of saving images locally, saving it on s3 is a better choice

[4slimbu]

This is an api. So, if someone wants to save image in s3, they will do it on the app itself. If we add support for s3, then it means the image need to be uploaded to the api and then to s3. So, may be s3 implementation isn't that great.