feat(nx): upgrade nx 20 and angular 19

apps/angular/6-structural-directive/src/app/app.component.ts

@@ -2,7 +2,6 @@ import { Component } from '@angular/core';
 import { RouterOutlet } from '@angular/router';
 
 @Component({
-  standalone: true,
   imports: [RouterOutlet],
   selector: 'app-root',
   template: `

apps/angular/6-structural-directive/src/app/dashboard/admin.component.ts

@@ -4,7 +4,6 @@ import { ButtonComponent } from '../button.component';
 
 @Component({
   selector: 'app-dashboard',
-  standalone: true,
   imports: [RouterLink, ButtonComponent],
   template: `
     <p>dashboard for Admin works!</p>

apps/angular/6-structural-directive/src/app/information.component.ts

@@ -4,7 +4,6 @@ import { UserStore } from './user.store';
 
 @Component({
   selector: 'app-information',
-  standalone: true,
   imports: [CommonModule],
   template: `
     <h2 class="mt-10 text-xl">Information Panel</h2>

apps/angular/6-structural-directive/src/app/login.component.ts

@@ -14,7 +14,6 @@ import {
 import { UserStore } from './user.store';
 
 @Component({
-  standalone: true,
   imports: [InformationComponent, RouterLink, ButtonComponent],
   selector: 'app-login',
   template: `