Fix references to old Node 4 cluster

[yavorg]

These need to be updated to the new cluster.
https://github.com/goextend/getting_started/search?utf8=✓&q=%22webtask.io%22
https://github.com/goextend/getting_started/search?utf8=✓&q=%22webtask.it.auth0.com%22