Integrate and migrate block storage system like S3 or DO Spaces

[melizeche]

with multiple servers this is a mess, this is low priority atm

[jcarizza]

@melizeche Once this feature is implemented here is how to serve static files under your domain doing a proxy of S3 with nginx.

https://stackoverflow.com/questions/44639182/nginx-proxy-amazon-s3-resources#44749584