Remove Geizhals integration (ADR-0004)

[frenck]

Proposed change

The Geizhals integration has been removed from Home Assistant because it relies on web scraping, which is no longer allowed.

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 logo's 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 Geizhals integration (ADR-0004) core#48594
• Link to parent pull request in the Brands repository: Remove Geizhals integration (ADR-0004) brands#2381
• This PR fixes or closes issue:

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.