add calculation of ingredients based on servings

frontend/src/components/RecipeEditor.tsx

@@ -20,6 +20,7 @@ export default function RecipeEditor({ recipe, onSave, onCancel }: RecipeEditorP
     setDraft({ ...draft, ingredients })
   }
    if (!recipe) return <div>Oops, there's no recipe in RecipeEditor...</div>
+  // @todo add handling of images
   return (
     <div className="p-4 gap-10">
       <h2 className="content-title">