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Description

Existing picture is stale, and points the user to a location that no longer applies.
This is only supplying a new webp format image that can be used for documentation.

Fixes # (issue)

How Has This Been Tested?

Only formatted and included a new picture.

Checklist:

• [ X] I have performed a self-review of my own code
• [ X] I have made corresponding changes to the documentation if applicable
• [ X] I have no unrelated changes in the PR.
• [ X] I have confirmed that any new dependencies are strictly necessary.
• [ X] I have written tests for new code (if applicable)
• [ X] I have followed naming conventions/patterns in the surrounding code
• [ X] All code in src/services/ uses repositories implementations for database calls, filesystem operations, etc.
• [ X] All code in src/repositories/ is pretty basic/simple and does not have any immich specific logic (that belongs in src/services/)