Quick fix

- removed the popper variable, update gulpfile accordingly
3 jobs for 20-demo-page-does-not-exist in 1 minute and 1 second (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #3719
build

00:00:29

 
  Deploy
passed #3720
pages

00:00:31

passed pages:deploy

00:00:00