docs: add Domoticz power section

[olivierberthomme]

Example of a Domoticz integration for power module (tested with domoticz release 2023.2)

[Arksine]

Thanks. The change looks ok, however the commit needs to be signed off before merging.

I may consider creating a folder in the docs path and moving the power examples there, however for the time being it is ok for them to be inline.

[olivierberthomme]

Replaced by #742