componentDidMount () {
      const imagePaths = [
          '/static/images/illustrations/astronaut.png',
          '/static/images/wheel/contributions-communautes-techniques.png',
          '/static/images/wheel/offre.png',
          '/static/images/wheel/recrutement.png',
          '/static/images/wheel/vie-interne.png'
      ]
      var promises = []
      imagePaths.forEach(function (imagePath) {
          const promise = new Promise(function(resolve, reject) {
              let image = new Image();
			   image.src = imagePath;// ici le chargement de l'image commence
               image.addEventListener('load', resolve)
               image.addEventListener('error', reject)
          });
          promises.push(promise)
      })

      Promise.all(promises).then((values) => {
          setTimeout(() => {
              this.setState({
                  loaded: true
              })
          }, 1000)
      })
  }