gergo/yarn (#753)

* yarn first go

* fix frontend build cache loader

* yarn workspaces built server Docker

* build(yarn): add workspaces plugin config

* chore(package defs): clean package*.json -s

* chore(gitignore): ignore yarn error log

* build(yarn): update yarn lock

* build(preview-service webpack): add extra resolved path to preview service webpack config

because of yarn package hoisting, there are no package level node_modules folder anymore.

* build(docker): update dockerignore with yarn specific configs

* build(docker): update Dockerfiles for yarn workspaces utilization

* ci(circleci): update server test job to yarn

* ci(circle): disable cache restore

* ci(circleci): trying the node orb yarn-run

* ci(circleci): yarn-run again

* ci(circleci): disable node orb

* ci(circleci): change base node image for tests

* ci(circleci): add yarn cache

* ci(circleci): remove node install step

* ci(circleci): add server specific cache archives

* ci(circleci): test build and publish

* ci(circleci): change npm auth method to suit yarn

* ci(circleci): trying new builder image

* ci(circleci): another base image, maybe this works

* ci(circleci): force a specific docker engine version

* ci(circleci): add yarn version plugin and its changes

* ci(circleci): cleanup and remove temp branch config

* chore(package defs): moving from npm run to yarn

* explicitly specifying webpack4 as a frontend dep

* chore(package defs): replace npm with yarn everywhere

* docs(root readme): update with some yarn specific docs

* chore(root workspace): update dev scripts and package lock

* ci(circleci): enable package publish step with yarn

Co-authored-by: Fabians <fabis94@live.com>

.dockerignore

@@ -6,9 +6,17 @@ test-queries
 .editorconfig
 Contributing.md
 ISSUE_TEMPLATE.md
-lerna.json
 **/.env
 .env.example
 .eslintrc.json
 .mocharc.js
 readme.md
+**/Dockerfile
+
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions