Add binary sensors to OpenEVSE documentation

[firstof9]

Proposed change

This PR documents the new binary sensor entities added to the OpenEVSE integration:

• Divert active: Whether solar PV divert charging is currently active.
• Ethernet connected: Whether the charger is connected via Ethernet (disabled by default).
• Limit active: Whether a charging limit is currently active (disabled by default).
• MQTT connected: Whether the charger's MQTT client is connected to a broker (disabled by default).
• Shaper active: Whether the power shaper is currently active.
• Vehicle connected: Whether a vehicle is plugged into the charger.

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 binary sensor platform to openevse core#172924
• 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

Note

Copilot was unable to run its full agentic suite in this review.

Adds documentation and metadata updates for newly supported OpenEVSE binary sensor entities.

Changes:

• Registers the binary_sensor platform for the OpenEVSE integration.
• Documents the set of binary sensor entities provided by the integration.