Add disconnection and minor improvements on login page.

frontend/src/app/pages/disconnection/disconnection.component.ts

@@ -0,0 +1,21 @@
+import { Component, OnInit, inject } from '@angular/core';
+import {MatProgressSpinnerModule} from '@angular/material/progress-spinner'; 
+import { AuthenticationService } from '../../core/service/authentication.service';
+import { Router } from '@angular/router';
+
+@Component({
+  selector: 'app-disconnection',
+  standalone: true,
+  imports: [MatProgressSpinnerModule],
+  templateUrl: './disconnection.component.html',
+  styleUrl: './disconnection.component.scss'
+})
+export class DisconnectionComponent implements OnInit {
+  private authenticationService = inject(AuthenticationService);
+  private router = inject(Router);
+
+  ngOnInit(): void {
+    this.authenticationService.unauthenticate();
+    this.router.navigate(['/home']);
+  }
+}