dhi: update mirroring ux

[craig-osterhout]

Description

Updated mirroring flow.

• Removed the step to choose a name. Users can no longer choose a name unless it's already been mirrored. Even then, there's now a default name, so not required.
• Removed the screenshot of the mirror screen. The screen is now different. Removed instead of updated as there is nothing complex. Previously had it to show an example of the name prefixed with dhi-.
• Updated screenshot of mirror button.

Updated topics:

• https://deploy-preview-23571--docsdocker.netlify.app/dhi/get-started/#step-3-mirror-the-image
• https://deploy-preview-23571--docsdocker.netlify.app/dhi/how-to/mirror/#mirror-an-image-repository

Related issues or tickets

https://docker.slack.com/archives/C0989V6TAK0/p1760358028944909

Reviews

• Editorial review

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