release: stable-4627

* fdf5030c prosody: update configuration
* afafe236 prosody: shrink container size
* 8e7ea34c base: fix setting timezone
* 58441ae0 doc: update README
* 3c125269 etherpad: update to version 1.8.4
* 0038e718 jibri: install extra dependency
* 0615ed6e doc: add missing volumes to quick start
* 27818652 doc: clarify usage of gen-passwords.sh
* a8d0b6ca build: add PHONY target for "release"
* d4a35a6d misc: working on latest