Add Alicloud, Online, Packet, and Scaleway scenario guides (#7714)
* Add Alicloud, Packet, and Scaleway scenario guides.
These were taken from
3f12228c79/docs/docsite/rst/scenario_guides
and adjusted to reality.
* Fix references.
* Add Online guide.
* Add BOTMETA entries.
* Use FQCN.
* Improve code formatting and indentation.
* Update BOTMETA.
(cherry picked from commit 838e4e3f02)
Co-authored-by: Felix Fontein <felix@fontein.de>
