remove availability scroll stuff

src/components/molecules/Availability.jsx

@@ -8,52 +8,6 @@ class Availability extends PureComponent {
     super(props)
   }
 
-  componentDidMount() {
-    if (this.props.meta.availability.status === true) {
-      let supportsPassive = false
-
-      try {
-        const opts = Object.defineProperty({}, 'passive', {
-          get: function() {
-            supportsPassive = true
-          }
-        })
-        window.addEventListener('test', null, opts)
-      } catch (e) {
-        return e
-      }
-
-      window.addEventListener(
-        'scroll',
-        this.handleScroll,
-        supportsPassive ? { passive: true } : false
-      )
-    }
-  }
-
-  componentWillUnmount() {
-    window.removeEventListener('scroll', this.handleScroll)
-  }
-
-  handleScroll = () => {
-    let timeout
-    const footer = document.getElementsByClassName('footer')[0]
-    const availability = document.getElementsByClassName('availability')[0]
-
-    if (!timeout) {
-      timeout = setTimeout(function() {
-        timeout = null
-
-        if (footer.getBoundingClientRect().top <= window.innerHeight) {
-          availability.style.opacity = 0
-          window.removeEventListener('scroll', this.handleScroll)
-        } else {
-          availability.style.opacity = 1
-        }
-      }, 300)
-    }
-  }
-
   render() {
     const { availability } = this.props.meta
     const { status, available, unavailable } = availability