access only to superadmin

access only to superadmin, admin and user will be see screen according to permission.
added logo to dashboard

src/app/dashboard/dashboard.component.html

@@ -1 +1,3 @@
-<p>dashboard works!</p>
+<div class="dashboard-bg">
+  <p>dashboard works!</p>
+</div>

src/app/dashboard/dashboard.component.scss

@@ -0,0 +1,14 @@
+.dashboard-bg {
+  position: relative;
+  min-height: 100vh;
+  z-index: 1;
+}
+.dashboard-bg::after {
+  content: "";
+  position: absolute;
+  inset: 0;
+  background: url('/assets/images/logo.png') center / contain no-repeat;
+  background-size: 350px;  
+  opacity: 0.5;    /* less transparent */
+  z-index: -1;
+}

src/app/services/authenticate.service.ts

@@ -81,7 +81,7 @@ export class AuthenticationService {
     isAdminUser(){
         if (this.storageService && this.storageService.getItem('user') != null) {
             let cachedUser = JSON.parse(this.storageService.getItem('user') || '{}');
-            return cachedUser.user.role === HiddenValues.ADMIN_USER || cachedUser.user.role === HiddenValues.SUPER_ADMIN;
+            return cachedUser.user.role === HiddenValues.SUPER_ADMIN;
         }
         return false;
     }