i18n(de): Bring outdated pages up-to-date

[deining]

This PR brings 4 German documentation pages up-to-date with the latest English version.

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Tracked Files

File	Note
de/getting-started.mdx	Localization changed, will be marked as complete.
de/guides/cms/index.mdx	Localization changed, will be marked as complete.
de/tutorial/2-pages/1.mdx	Localization changed, will be marked as complete.
de/upgrade-astro.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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