I18n(ar): update outdated translations

[Mu-selim]

Description

This pull request updates and improves the Arabic documentation for Astro by refining content, correcting terminology, and enhancing clarity across several guides and navigation files. The changes include better descriptions, improved instructions for editor and font setup, and a comprehensive translation of navigation labels.

Documentation and Guide Improvements

• Updated the editor setup guide to clarify instructions, add information about Biome and dprint tools, and refine Prettier installation/configuration steps for accuracy and best practices. [1] [2] [3] [4]
• Improved the custom fonts guide by rewording explanations, adding a tip for the experimental fonts API, clarifying Fontsource usage, and providing better Tailwind integration instructions. [1] [2] [3]

Content and Terminology Refinement

• Enhanced the getting started page with more descriptive text, accurate terminology, and clearer instructions for project setup and learning resources. [1] [2] [3]

Navigation Localization

• Added a full set of Arabic translations for navigation labels, improving accessibility and user experience for Arabic-speaking users.

• Closes #
• Suggested label:

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

File	Note
ar/editor-setup.mdx	Localization changed, will be marked as complete.
ar/getting-started.mdx	Localization changed, will be marked as complete.
ar/guides/fonts.mdx	Localization changed, will be marked as complete.
src/content/nav/ar.ts	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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