feat: enhance application structure and improve accessibility

- Refactor various components for better readability and maintainability.
- Update HTML templates to include `alt` attributes for images and `for` attributes for labels.
- Implement reactive forms in OTP component and improve token management in AuthService.
- Adjust routing to redirect to 'admin/about' by default.
- Remove deprecated interceptor implementation and streamline authentication logic.
- Add console logs for better debugging during initialization.

src/app/app.routes.ts

@@ -16,7 +16,7 @@ const enum AdminRouteTitles {
 export const routes: Routes = [
     {
         path: '',
-        redirectTo: 'admin',
+        redirectTo: 'admin/about',
         pathMatch: 'full'
     },
     {
@@ -24,11 +24,6 @@ export const routes: Routes = [
         component: AdminLayout,
         title: 'Admin',
         children: [
-            {
-                path: '',
-                redirectTo: 'about',   // ✔ correct relative redirect
-                pathMatch: 'full'
-            },
             {
                 path: 'login',
                 component: OtpComponent,