Proxmox add button platform

[erwindouna]

Proposed change

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 button platform to Proxmox core#163791
• 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 button platform in the Proxmox VE integration. The PR corresponds to a parent pull request in the core repository that adds button entities to control Proxmox nodes, VMs, and LXC containers.

Changes:

• Added "Button" to the ha_category list in the front matter
• Added a new "Button" section documenting 9 button entities for controlling Proxmox nodes, VMs, and LXC containers

[c0ffeeca7]

Thank you, @erwindouna 👍