Document integration with backblaze adapter

[tacman]

This is probably outside of the scope of this bundle, but I'll ask anyway, in case someone has experience in it and it's easy to share.

Backblaze advertises itself as an s3-compatible service that costs 1/5 of what Amazon does. So I'd love to see an example of configuring this with LIIP.

On the plus side, it's easy to set up a free 5G account, and it's MUCH easier to configure than S3.

Maybe s3 is cheaper if it's configured correctly, but setting up permissions and storage types are pretty complicated, especially for a small project backblaze seems much easier to use.

Eventually, I have millions of images to upload, so better pricing seems worth investigating.