Update README.md

Signed-off-by: Joseph Garrone <joseph.garrone.gj@gmail.com>

Author: garronej

README.md

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     <img src="https://github.com/codegouvfr/react-dsfr/releases/download/assets/dsfr-react_repo-card.png">  
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-    🇫🇷 <i><a href="https://www.systeme-de-design.gouv.fr/">French State Design System</a> React integration</i> 🇫🇷 
+    🇫🇷 <i><a href="https://www.systeme-de-design.gouv.fr/">French State Design System</a> React toolkit</i> 🇫🇷 
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     <a href="https://github.com/codegouvfr/react-dsfr/actions">