i18n(fr): update guides/css-and-tailwind

[HiDeoo]

Description

This PR updates the French version of the guides/css-and-tailwind page with the changes from #2322.

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Tracked Files

Locale	File	Note
fr	guides/css-and-tailwind.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.

[HiDeoo]

Not a huge fan but this is what it is:

• https://developer.mozilla.org/fr/docs/Web/CSS/@layer
• https://developer.mozilla.org/fr/docs/Web/CSS/CSS_cascade/Cascade#couches_de_la_cascade

[ArmandPhilippot]

LGTM, just a nit for a link available in French.