switch from Google Analytics to (Inria's) Piwik for the main website

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doc for Inria's centralized Piwik instance is at:

• https://wiki.inria.fr/support/Piwik
• https://wiki.inria.fr/support/Configurer_votre_site_WordPress_pour_utiliser_Piwik

This has now been done, using the Wordpress customizer > Additional header scripts.