Fix: Add robots meta tag to NotFoundPageComponent for SEO compliance

Author: KosMaster87

src/app/shared/pages/not-found-page/not-found-page.component.spec.ts

@@ -69,6 +69,7 @@ describe('NotFoundPageComponent', () => {
           'The page you are looking for could not be found. Return to homepage or explore other sections.',
         ogTitle: '404 - Page Not Found',
         ogUrl: 'https://portfolio.dev2k.org/404',
+        robots: 'noindex, nofollow',
       });
     });