i18n(ar): Update why-astro.mdx

[wpplumber]

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I translated why-astro.mdx.

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• Suggested label: i18n

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	Apr 22, 2024 5:37pm

[astrobot-houston]

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Tracked Files

Locale	File	Note
ar	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.