* add readme section on using amazon/aws s3 as storage
* mention http/https confusion caused by incorrectly configured cloudflare
* improve custom-font notes
* docker: ftp-server howto
* docker: suggest moving hist-folders into the config path
and switch the idp docker-compose files to use the
main image, in anticipation of v1.11
connections from outside the specified list of IP prefixes are rejected
(docker-friendly alternative to -i 127.0.0.1)
also mkdir any missing folders when logging to file