The tooling for boilerplate was also running `yarn install` on the examples'
shared folder. But since this is handled by `ng-packages-installer` this
commit refactors the tools so that the boilerplate no longer does this
anymore.
PR Close#19511
This commit also updates the version of `@angular/cli` used for docs examples.
The previous (transient) dependency `@ngtools/webpack` was not compatible with
`@angular/compiler-cli@>=5` and was breaking when running against the local
builds (currently at 5.0.0-beta.2). The version of `@ngtools/webpack` used by
the latest `@angular/cli` version is compatible with `@angular/compiler-cli@5`.