Converted everything to use a store

src/app/store/newProduct/newProduct.component.html

@@ -8,7 +8,7 @@
         </mat-form-field>
         <mat-form-field class="w-100">
             <mat-select placeholder="Category" name="category" [(value)]="category">
-                <mat-option *ngFor="let c of categories | async" [value]="c.name">{{c.name}}</mat-option>
+                <mat-option *ngFor="let c of store.categories | async" [value]="c.name">{{c.name}}</mat-option>
             </mat-select>
         </mat-form-field>
         <mat-form-field class="w-100">