Updates for all angular.io links to the new angular.dev domain. Additionally, adjustment to new resources where the equivalent does not exist on the new site (e.g. Tour of Heroes tutorial)
This fixes an issue which caused the new provider to be added in the position of the trailing comma. With this change the trailing comma is retained.
Closes#26911
Currently writing schematics that support both NgModule-based and standalone projects is tricky, because they have different layouts. These changes introduce two new APIs that work both on NgModule and standalone projects and can be used by library authors to create their `ng add` schematics. Example rule for adding a `ModuleWithProviders`-style library:
```ts
import { Rule } from '@angular-devkit/schematics';
import { addRootImport } from '@schematics/angular/utility';
export default function(): Rule {
return addRootImport('default', ({code, external}) => {
return code`${external('MyModule', '@my/module')}.forRoot({})`;
});
}
```
This rulle will add `imports: [MyModule.forRoot({})]` to an NgModule app and `providers: [importProvidersFrom(MyModule.forRoot({}))]` to a standalone one. It also adds all of the necessary imports.
