Users as sellers

Any user that signs up on the MERN Marketplace can choose to become a seller by updating their profile:

In contrast to being a regular user, becoming sellers will allow users to create and manage their own shops where they can manage products:

To add this seller feature, we need to update the user model, the Edit Profile view, and add a MY SHOPS link to the menu that will only be visible to sellers.

Updating the user model

The user model will need a seller value that will be set to false by default to represent regular users, and can be set to true to represent users who are also sellers.

mern-marketplace/server/models/user.model.js:

seller: {
    type: Boolean,
    default: false
}

The seller value must be...