added postcss stuff

1 job for master in 9 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Deploy
failed deploy #476

00:00:09

 
Name Stage Failure
failed
deploy Deploy
  Processed images |  0  
Aliases | 0
Sitemaps | 1
Cleaned | 0

Total in 1496 ms
$ npx netlify-cli deploy --site $NETLIFY_SITE_ID --auth $NETLIFY_AUTH_TOKEN --prod
bash: line 82: npx: command not found
ERROR: Job failed: exit status 1