Redirect first-time visitors to info page

Updated routing to use MainPage as the default route and added logic in App component to redirect users to the /info page on their first visit using sessionStorage.

src/app/app.ts

@@ -1,4 +1,5 @@
-import { Component, signal } from '@angular/core';
+import { Component, OnInit, signal } from '@angular/core';
+import { Router } from '@angular/router';
 
 @Component({
   selector: 'app-root',
@@ -6,6 +7,17 @@ import { Component, signal } from '@angular/core';
   standalone: false,
   styleUrl: './app.css',
 })
-export class App {
+export class App implements OnInit{
   protected readonly title = signal('infinifront');
+
+  constructor(private router: Router) {}
+
+  ngOnInit(): void {
+    const hasVisited = sessionStorage.getItem('hasVisited');
+
+    if (!hasVisited) {
+      sessionStorage.setItem('hasVisited', 'true');
+      this.router.navigateByUrl('/info', { skipLocationChange: true });
+    }
+  }
 }