[de] Removing old CSS includes from K8s basics tutorials

[shurup]

German tutorials still include old CSS files. However, if you visit these pages, the browser will try to access them and return 404 (e.g.). They were removed from the English tutorials in #34188. This PR removes them from the German localisation.

/sig docs
/language de
/area localization

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[dipesh-rawat]

The proposed changes looks to be inline with 'en' changes as part of PR#34188.
LGTM

[rlenferink]

Seems okay to me !

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rlenferink

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 4e9b1acbfc6aa1cf098f98480e886b0244ef939e

[shurup]

Thanks, @rlenferink!

Not directly related to this PR, but since https://katacoda.com/embed.js was included on those pages next to the CSS files I removed here, I also wanted to let you know that all Katacoda-related pieces should be removed from the localisation since these interactive tutorials are not supported anymore and need replacing. Here is an umbrella issue for this task #41496

[rlenferink]

Thanks for bringing this up! In case you want to remove those, feel extremely welcome to open another PR.

[shurup]

I'd be happy to, but simply removing this Katacoda JS file won't be enough — actually, that's why I didn't do it in this PR already. To get rid of Katacoda, many texts need corrections, which I can't do without German knowledge. I can open an issue for your localisation where this task will be described (so someone else can work on it) — if that helps.