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/admin/resume/resume.html

@@ -20,7 +20,7 @@
 
             <li class="timeline-item">
 
-                <h4 class="h4 timeline-item-title">{{education.degree}}{{education.degreeSpecialization != null ? " - "
+                <h4 class="h4 timeline-item-title">{{education.degree}}{{education.degreeSpecialization !== null ? " - "
                     + education.degreeSpecialization : ""}}</h4>
 
                 <span>{{education.period}}</span>