explain why we don't cache docker layers in the doc
explain why we don't cache docker layers in the doc

copy/paste of Gordon's intercom reply:
https://app.intercom.io/a/apps/vnk4oztr/inbox/conversation/504069843

prathamesh-sonpatki/frontend,RayRutjes/frontend,circleci/frontend,circleci/frontend,circleci/frontend,RayRutjes/frontend,prathamesh-sonpatki/frontend