Chapter 4,6: prettier updates and web framework samples

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+# Services Folder
+
+Services define routes within your application. Fastify provides an
+easy path to a microservice architecture, in the future you might want
+to independently deploy some of those.
+
+In this folder you should define all the services that define the routes
+of your web application.
+Each service is a [Fastify
+plugin](https://www.fastify.io/docs/latest/Plugins/), it is
+encapsulated (it can have its own independent plugins) and it is
+typically stored in a file; be careful to group your routes logically,
+e.g. all `/users` routes in a `users.js` file. We have added
+a `root.js` file for you with a '/' root added.
+
+If a single file become too large, create a folder and add a `index.js` file there:
+this file must be a Fastify plugin, and it will be loaded automatically
+by the application. You can now add as many files as you want inside that folder.
+In this way you can create complex services within a single monolith,
+and eventually extract them.
+
+If you need to share functionality between services, place that
+functionality into the `plugins` folder, and share it via
+[decorators](https://www.fastify.io/docs/latest/Decorators/).