message: Add intro to Events section
diff: @@ -1630,6 +1630,17 @@ embla.destroy()
  ## Events
  +Embla exposes custom events that can be hooked on to. Example usage:
  +
  +```javascript
  +embla.on('select', () => {
  + console.log(`Selected snap has changed to ${embla.selectedScrollSnap()}.`)
  +})
  +embla.on('scroll', () => {
  + console.log(`Current scroll progress is ${embla.scrollProgress()}.`)
  +})
  +```
  +
  ##### `init`
  <details>
  