Get rid of sed hack to get ami image

[roffe]

JQ can get the value directly without sed magic

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @roffe. Thanks for your PR.

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[rdrgmnzs]

@roffe would you mind updating docs/images.md as well to keep them consistent?

Also please sign the CLA when you get a chance, otherwise thanks for the PR this looks great!

[roffe]

I'll make a new PR with both files updated as soon as i got the CLA sorted with my employer