i18n(de): update guides/integration-guide/index.mdx

[trueberryless]

Description (required)

• update guides/integration-guide/index.mdx

Related issues & labels (optional)

• 5.0.0 beta docs #9240
• feat(integration-guide): make some changes to the guides/integration-guide/index.mdx #10448
• Suggested label: i18n

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🔄️	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.

[trueberryless]

Actually, there are no changes in #9240 but many other outdated changes, I'm too lazy to list them all rn, sry