i18n(de): update why-astro.mdx

[louisescher]

Description (required)

I noticed a few sentences in the German translations of the "Why Astro" page which I considered to not necessarily be wrong, but clunky to read. This PR mainly aims to improve the translation by updating some wording, keeping the meaning intact but making it easier to read.

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de/concepts/why-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.

[DerTimonius]

The changes make sense, I'm not really sure about the removal of the ­ hyphens though

[DerTimonius]

LGTM 🚀

[trueberryless]

Super Vorschläge, vielen Dank Lou!

Ich habe nur eine kleine Verbesserung, ansonsten top, Chapeau!

[trueberryless]

Awesome, thanks very much again @louisescher