Update the wiki with more information on devices.json location

[a-elkaim]

Hi,

First of all, thank you for this repository and your hard work, this is beyond amazing!

I struggled a bit with the devices.json location and I think adding more information on the whereabouts of the devices.json file when installing through HomeAssistant could be a great addition.

Something like:

Note: devices.json should be located under /root/addon_configs/FOLDERID_hcpy/ if you installed through HomeAssistant Addon Store)

I tried do make a PR but it seems GitHub wikis are not forkable to make contributions ...

Thank you for considering this ! :)