remove deep_sleep binary_sensor from fressnapf_tracker

[eifinger]

Proposed change

Old app versions are using deep sleep but the backend does not support this anymore.
It got replaced by energy_saving. The app still calls it "Sleep mode".

I will implement Sleep mode / energy saving in the switch platform.

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: remove deep_sleep binary_sensor from fressnapf_tracker core#157857
• 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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Pull request overview

This PR removes the documentation for the deprecated "Deep Sleep Status" binary sensor from the Fressnapf Tracker integration, aligning with backend changes where deep_sleep functionality has been replaced by energy_saving.

• Removes outdated "Deep Sleep Status" entity documentation
• Keeps the documentation synchronized with the backend API changes

[c0ffeeca7]

Thank you, @eifinger 👍