Add manual standalone docker example instructions to creating-zones.md

[pmffromspace]

Making the zone setup more accessible, improving usability of presence sensor zones for homeassistant setups via docker or without supervisor.

[EverythingSmartHome]

Thanks for the PR, looks good except we can make one small change to make it simpler

[pmffromspace]

You are right. I fixed it.

[EverythingSmartHome]

Thanks!