feat: configure cors to allow front end connection

fix: resolve merge conflicts

feat: add cors middleware to enable front end

Revert "feat(Order): bring orders in ascending order according to the creation date"

feat: display categories coming from the API

chore: create script to run node in 'dist' folder

feat: remove validation of id existence as it is not necessary

feat: validate id's with the mongoose function

feat(Order): bring orders in ascending order according to the creation date

feat(Order): populate the products of each order

feat: implement 'Order' model use cases

refactor: separate multer configuration file

refactor(Product): allow empty ingredients when creating products

feat(Category): implements the listing of products by category in use cases of the 'Category' model

refactor(Product): create class 'Product' to handle the use cases of model 'Product'