Store static assets on S3/DO/Azure/...

[ivan-bocharov]

In the early stages of our website development there was no need for separate hosting for binary static assets (paper PDFs, zipped archives, etc.). However, as time went by, the size of the repository grew significantly. Publishing/cloning process is quite slow and painful as well.

Unfortunately, git-lfs is not supported by Github Pages. In order to remedy repository growth, we should consider storing our binary static assets on a separate server (S3 bucket, Azure machine, etc.) and point a subdomain to this machine.

The uploading of said assets also has to require minimal manual intervention from user side (preferably, it has to happen during make publish run).