build: delete @angular-devkit/build-ng-packagr

BREAKING CHANGE:

Deprecated `@angular-devkit/build-ng-packagr` has been removed.
Please use `ng-packagr` builder from `@angular-devkit/build-angular`
instead.

Note: this change doesn't effect application and library developers,
as they will be migrated to use the new builder during ng update.

Author: kyliau

CONTRIBUTING.md

@@ -217,7 +217,6 @@ The following is the list of supported scopes:
 * **@angular-devkit/architect-cli**
 * **@angular-devkit/benchmark**
 * **@angular-devkit/build-angular**
-* **@angular-devkit/build-ng-packagr**
 * **@angular-devkit/build-optimizer**
 * **@angular-devkit/build-webpack**
 * **@angular-devkit/core**

README.md

@@ -186,7 +186,6 @@ This is a monorepo which contains many tools and packages:
 |---|---|---|---|
 **Architect** | [`@angular-devkit/architect`](https://npmjs.com/package/@angular-devkit/architect) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Farchitect/latest.svg)](https://npmjs.com/package/@angular-devkit/architect) | [![README](https://img.shields.io/badge/README--green.svg)](/packages/angular_devkit/architect/README.md) [![snapshot](https://img.shields.io/badge/snapshot--blue.svg)](https://github.com/angular/angular-devkit-architect-builds)
 **Build Angular** | [`@angular-devkit/build-angular`](https://npmjs.com/package/@angular-devkit/build-angular) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Fbuild-angular/latest.svg)](https://npmjs.com/package/@angular-devkit/build-angular) | [![README](https://img.shields.io/badge/README--green.svg)](/packages/angular_devkit/build_angular/README.md) [![snapshot](https://img.shields.io/badge/snapshot--blue.svg)](https://github.com/angular/angular-devkit-build-angular-builds)
-**Build NgPackagr** | [`@angular-devkit/build-ng-packagr`](https://npmjs.com/package/@angular-devkit/build-ng-packagr) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Fbuild-ng-packagr/latest.svg)](https://npmjs.com/package/@angular-devkit/build-ng-packagr) | [![README](https://img.shields.io/badge/README--green.svg)](/packages/angular_devkit/build_ng_packagr/README.md) [![snapshot](https://img.shields.io/badge/snapshot--blue.svg)](https://github.com/angular/angular-devkit-build-ng-packagr-builds)
 **Build Optimizer** | [`@angular-devkit/build-optimizer`](https://npmjs.com/package/@angular-devkit/build-optimizer) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Fbuild-optimizer/latest.svg)](https://npmjs.com/package/@angular-devkit/build-optimizer) | [![README](https://img.shields.io/badge/README--green.svg)](/packages/angular_devkit/build_optimizer/README.md) [![snapshot](https://img.shields.io/badge/snapshot--blue.svg)](https://github.com/angular/angular-devkit-build-optimizer-builds)
 **Build Webpack** | [`@angular-devkit/build-webpack`](https://npmjs.com/package/@angular-devkit/build-webpack) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Fbuild-webpack/latest.svg)](https://npmjs.com/package/@angular-devkit/build-webpack) | [![README](https://img.shields.io/badge/README--green.svg)](/packages/angular_devkit/build_webpack/README.md) [![snapshot](https://img.shields.io/badge/snapshot--blue.svg)](https://github.com/angular/angular-devkit-build-webpack-builds)
 **Core** | [`@angular-devkit/core`](https://npmjs.com/package/@angular-devkit/core) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Fcore/latest.svg)](https://npmjs.com/package/@angular-devkit/core) | [![README](https://img.shields.io/badge/README--green.svg)](/packages/angular_devkit/core/README.md) [![snapshot](https://img.shields.io/badge/snapshot--blue.svg)](https://github.com/angular/angular-devkit-core-builds)