Add ANCT's Suite territoriale website to the README (#485)

Signed-off-by: Sylvain Zimmer <sylvain@sylvainzimmer.com>

Author: sylvinus

README.md

@@ -127,3 +127,4 @@ A few projects that use `@codegouvfr/react-dsfr`.
 -   https://signal.conso.gouv.fr
 -   https://territoiresentransitions.fr
 -   https://www.mediateur-public.fr
+-   https://suiteterritoriale.anct.gouv.fr