Modifier Category table added as a parent of modifiers

They are also linked to products / menu categroies as to which products they can be used on
The linking to menu categories is done in the frontend, database is linked directly to products
Treeview for menu categories yet to be done in modifier category detail form

bookie/src/app/home/home.component.html

@@ -19,6 +19,9 @@
 <a mat-raised-button  routerLink="/products">
   Products
 </a>
+<a mat-raised-button  routerLink="/modifier-categories">
+  Modifier Categories
+</a>
 <a mat-raised-button  routerLink="/taxes">
   Taxes
 </a>