Added paths and some standard code used in different projects

apps/dafa-web/src/app/pages/page-not-found/page-not-found.component.html

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+<digi-ng-typography-base [afCompressed]="true">
+  <section class="page-not-found">
+    <h1 class="heading">Oj då! Vi kan inte hitta sidan.</h1>
+    <p>Det kan bero på att länken du använder är felaktig eller att sidan inte längre finns.</p>
+    <a class="dafa__link dafa__link--with-icon" routerLink="/">
+      <digi-ng-icon-arrow-left class="dafa__digi-ng-icon" aria-hidden="true"></digi-ng-icon-arrow-left>
+      Gå tillbaka till startsidan
+    </a>
+  </section>
+</digi-ng-typography-base>

apps/dafa-web/src/app/pages/page-not-found/page-not-found.component.scss

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+.page-not-found {
+  text-align: center;
+  padding: 5rem;
+}

apps/dafa-web/src/app/pages/page-not-found/page-not-found.component.spec.ts

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+import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
+import { PageNotFoundComponent } from './page-not-found.component';
+
+
+describe('PageNotFoundComponent', () => {
+  let component: PageNotFoundComponent;
+  let fixture: ComponentFixture<PageNotFoundComponent>;
+
+  beforeEach(waitForAsync(() => {
+    TestBed.configureTestingModule({
+      declarations: [ PageNotFoundComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(PageNotFoundComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

apps/dafa-web/src/app/pages/page-not-found/page-not-found.component.ts

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+import { ChangeDetectionStrategy, Component } from '@angular/core';
+
+@Component({
+  selector: 'dafa-page-not-found',
+  templateUrl: './page-not-found.component.html',
+  styleUrls: ['./page-not-found.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class PageNotFoundComponent {}

apps/dafa-web/src/app/pages/page-not-found/page-not-found.module.ts

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+import { DigiNgIconArrowLeftModule } from '@af/digi-ng/_icon/icon-arrow-left';
+import { DigiNgTypographyBaseModule } from '@af/digi-ng/_typography/typography-base';
+import { CommonModule } from '@angular/common';
+import { NgModule } from '@angular/core';
+import { RouterModule } from '@angular/router';
+import { PageNotFoundComponent } from './page-not-found.component';
+
+@NgModule({
+  declarations: [PageNotFoundComponent],
+  imports: [
+    CommonModule,
+    RouterModule.forChild([{ path: '', component: PageNotFoundComponent }]),
+    DigiNgTypographyBaseModule,
+    DigiNgIconArrowLeftModule,
+  ],
+})
+export class PageNotFoundModule {}