ci: Speed up builds by caching node_modules (#1025)
ci: Speed up builds by caching node_modules (#1025)

This patch reduces the CircleCI build time by about ~2 minutes since do not have to `npm install` in most builds/scenarios.

dequelabs/axe-core,dequelabs/axe-core,dequelabs/axe-core,dequelabs/axe-core