Update Powerfox docs for FLOW meter

[klaasnicolaas]

Proposed change

Adds documentation for the newly supported Powerfox FLOW gas meter.

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 support for gas meter in Powerfox integration core#158196
• 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 pull request adds documentation for the newly supported Powerfox FLOW gas meter device, updating the Powerfox integration documentation to reflect this expanded functionality. The changes clarify how FLOW devices differ from other Poweropti meters in their data delivery method and document the specific sensors created for gas consumption monitoring.

Key changes

• Updated device support table to indicate FLOW gas meter support via report endpoint
• Expanded data updates section to explain the polling behavior difference between real-time meters and FLOW's report-based updates
• Added comprehensive documentation for FLOW gas meter sensors including consumption, energy, and cost metrics

[c0ffeeca7]

Thank you, @klaasnicolaas 👍