message: build(aio): move zip and live-example generation to `yarn predocs` task
  This will prevent the confusing errors for first time users who
  try to generate the docs with `yarn docs` and are told there are
  dangling links.
  Closes
  PR Close
diff: "preinstall": "node ../tools/yarn/check-yarn.js",
  "presetup": "yarn install --frozen-lockfile && yarn ~~check-env && yarn boilerplate:remove",
  "setup": "yarn aio-use-npm && yarn example-use-npm",
  - "postsetup": "yarn boilerplate:add && yarn build-ie-polyfills && yarn generate-stackblitz && yarn generate-zips && yarn docs",
  + "postsetup": "yarn boilerplate:add && yarn build-ie-polyfills && yarn docs",
  "presetup-local": "yarn presetup",
  "setup-local": "yarn aio-use-local && yarn example-use-local",
  "postsetup-local": "yarn postsetup",
  "check-env": "yarn ~~check-env",
  "postcheck-env": "yarn aio-check-local",
  "payload-size": "scripts/payload.sh",
  + "predocs": "yarn generate-stackblitz && yarn generate-zips",
  "docs": "dgeni ./tools/transforms/angular.io-package",
  "docs-watch": "node tools/transforms/authors-package/watchr.js",
  "docs-lint": "eslint --ignore-path=\"tools/transforms/.eslintignore\" tools/transforms",
  