Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/3086

* run the playbook on multiple hosts with different credentials with this script

* fix: add yaml missing document start "---"

* fix: *now really* allow this script to be run from any directory

* add about-note to examples/host.yml

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

* improve ansible-all-hosts.sh related docs/configuring-playbook.md

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

* fix typos :)

Co-authored-by: Slavi Pantaleev <slavi@devture.com>