User header component in app template

src/app/app.component.html

 <div fxLayout="column" fxFill>
-  <mat-toolbar color="primary">
-    <mat-toolbar-row>
-      <span class="app-toolbar-title">
-        {{ title }}
-      </span>
-      <!-- Insert navigation module here -->
-    </mat-toolbar-row>
-  </mat-toolbar>
+  <app-header></app-header>
   <div fxFlex class="app-component">
     <router-outlet></router-outlet>
   </div>