Remove blueprints package

The blueprints package causes confusion as it reintroduces a bunch of concepts that are not present in modern apps. And so blueprints are better than incorrect blueprints.

Author: NullVoxPopuli

ts/blueprints/ember-cli-typescript/index.js

@@ -149,7 +149,6 @@ module.exports = {
     let packages = [
       'typescript',
       '@tsconfig/ember',
-      'ember-cli-typescript-blueprints',
       '@types/ember',
       '@types/ember-resolver',
       '@types/ember__test-helpers',