i18n(fr): Add `guides/astro-db.mdx`

[thomasbnt]

Description (required)

Add guides/astro-db.mdx

Related issues & labels (optional)

• Related PR: https://github.com/withastro/docs/pull/7316 and https://github.com/withastro/docs/pull/7527
• Suggested label: i18n

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	May 7, 2024 2:57pm

[astrobot-houston]

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Tracked Files

Locale	File	Note
fr	guides/astro-db.mdx	Localization added, will be marked as complete.
fr	guides/integrations-guide/db.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. |

[thomasbnt]

Merci @pioupia pour la review!

[McFlyPartages]

LGTM