Add documentation about new HomeWizard battery group mode options

[DCSBL]

Proposed change

Add documentation about new modes for battery group mode:

• Zero mode (charge only)
• Zero mode (discharge only)

Also updated the incorrect names, to match Home Assistant and the HomeWizard app.

• Zero on meter → Zero mode
• Charge to full → Manual charge mode

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 new battery charge modes in HomeWizard core#159107
• 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 updates the HomeWizard integration documentation to reflect new battery group mode options and corrects existing mode names to match the Home Assistant UI and HomeWizard app terminology.

• Adds documentation for two new battery group modes: "Zero mode (charge only)" and "Zero mode (discharge only)"
• Renames existing modes for consistency: "Zero on meter" → "Zero mode" and "Charge to full" → "Manual charge mode"
• Adds a tip block documenting firmware version requirements for the new modes

[c0ffeeca7]

Thank you, @DCSBL 👍