Added sorting (Fixes #15)

src/app/formulaManager/formulaManager.component.ts

@@ -27,7 +27,7 @@ export class FormulaManagerComponent {
   }
 
   constructor(private db: AngularFirestore, public electron: ElectronService) {
-    this.formulas = this.db.collection('formulas').valueChanges();
+    this.formulas = this.db.collection('formulas', ref => ref.orderBy('name')).valueChanges();
   }
 
   displayFormula(formula) {

src/app/store/categories.component.ts

@@ -34,7 +34,7 @@ export class CategoriesComponent {
       if (!this.category) this.breadcrumb.clear();
 
       this.categories = this.db
-        .collection('categories')
+        .collection('categories', ref => ref.orderBy('name'))
         .valueChanges()
         .pipe(
           map(rows =>