Add documentation for Sure Petcare Device Tracker

[AlexC]

Proposed change

Add documentation for Sure Petcare Device Tracker

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: Implement Device Tracker for surepetcare Pets core#157537
• 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

This PR adds documentation for the newly implemented device tracker functionality in the Sure Petcare integration. The device tracker feature allows users to monitor whether their pets are currently inside or outside based on data from Sure Petcare Connect devices.

Key changes:

• Adds device tracker to the integration's categories and platforms
• Documents the device tracker entity states (Home, Away, Unknown)
• Documents available state attributes (since, where)