Add zone UI info

[RosemaryOrchard]

Proposed change

Add a screenshot of the UI config for a zone, and some info on how to set the location of a zone.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logo's and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

A user in Discord today was confused by how to configure a zone. This isn't the first time I've seen that, so I thought adding some documentation would be a good first step.

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[frenck]

Small readability suggestion.

[RosemaryOrchard]

Nice improvement, thank you!

[frenck]

Thanks, @RosemaryOrchard 👍