GeoNet NZ Quakes add quality scale

[exxamalte]

Proposed change

This change adds the newly acquired quality scale, and fixes the image path.

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).
• 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: GeoNet NZ Quakes code improvements core#32338
• 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.

[frenck]

This value is automatically synced to the docs. It is fine to leave it in, however, it could have been committed to the current branch already without this change.

[frenck]

✅ Approved. Can be merged as soon as the parent PR gets merged.