Add mention of image platform

[elupus]

Proposed change

Update docs for new image entity in gardena integration

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 logos 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

• Link to parent pull request in the codebase: Add watering contours for gardena core#178776
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

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.

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[Copilot]

Pull request overview

Updates the Gardena Bluetooth integration documentation to reflect the new Image entity support (watering contours) added in Home Assistant Core.

Changes:

• Added Image to the integration’s ha_category metadata.
• Added the image platform to ha_platforms.
• Added a short note explaining that watering contours are exposed as image entities for Aqua Contours devices.

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[fdmarcin]

This looks good, thanks! Approving and merging.