Investigate brotli compression

Apparently Brotli is a newish compression algorithm that is 25% smaller than gzip and has decent browser support. At a glance it’s not totally clear how easy it would be to actually enable—does not seem that CloudFlare has built-in support, so we would probably need to generate compressed assets on Travis and then figure out how to configure S3 to use the Brotli asset when the Accept header allows it. Also would need to make sure CloudFlare is varying the cache properly (and I think I might remember something about CF overwriting the Accept header to the origin?)

Commencez par retracer le flux de génération des assets et de déploiement mentionné dans l’issue, notamment Travis, S3, CloudFlare et la gestion de l’en-tête Accept. Le travail est considéré comme terminé lorsqu’il est établi si Brotli peut être activé de manière fiable et qu’une voie d’implémentation concrète est documentée, notamment la variation du cache et les considérations relatives à la prise en charge par les navigateurs.