i18n(de): update concepts/why-astro.mdx

[trueberryless]

Description (required)

• update concepts/why-astro.mdx

Related issues & labels (optional)

• [why-astro] #5428
• Upgrade to Astro v3 guide #4166
• docs: update CMS link #3556
• updated web frameworks to include others #2067

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de/concepts/why-astro.mdx	Localization changed, will be marked as complete.
de/guides/migrate-to-astro/from-create-react-app.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.

[jsparkdev]

Thank you @trueberryless !

I would like to request two modifications.

1. please make the arrows on lines 57 and 58 the same as the other arrows.
2. the last paragraph of the heading Entwicklerorientiert doesn't seem to exist, please add it.

[jsparkdev]

On line 54 of from-create-react-app.mdx, there is a link to /de/concepts/why-astro/#inhaltsfokussiert. However, in the modified file, there is no corresponding heading, resulting in an error.

[trueberryless]

All links should be fixed now! 😊

[jsparkdev]

good. LGTM!