Fix variable names in seed examples for offline mode

[bastianpaetzold]

The "Offline Mode" documentation was refering to variable names with underscores in the seed configuration instead of their camel case version. I assume those are old name formats that were replaced at some point.

Additionally I removed the notion of hyperkube_image, which does not exist in the current CRD version, so I assume this is a legacy thing as well.

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