Chapter 4,6: prettier updates and web framework samples

Chapter06/fastify-generated-app/plugins/README.md

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+# Plugins Folder
+
+Plugins define behavior that is common to all the routes in your
+application. Authentication, caching, templates, and all the other cross
+cutting concerns should be handled by plugins placed in this folder.
+
+Files in this folder are typically defined through the
+[`fastify-plugin`](https://github.com/fastify/fastify-plugin) module,
+making them non-encapsulated. They can define decorators and set hooks
+that will then be used in the rest of your application.
+
+Check out:
+
+* [The hitchhiker's guide to plugins](https://github.com/fastify/fastify/blob/master/docs/Plugins-Guide.md)
+* [Fastify decorators](https://www.fastify.io/docs/latest/Decorators/).
+* [Fastify lifecycle](https://www.fastify.io/docs/latest/Lifecycle/).

Chapter06/fastify-generated-app/plugins/support.js

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+'use strict'
+
+const fp = require('fastify-plugin')
+
+// the use of fastify-plugin is required to be able
+// to export the decorators to the outer scope
+
+module.exports = fp(function (fastify, opts, next) {
+  fastify.decorate('someSupport', function () {
+    return 'hugs'
+  })
+  next()
+})
+
+// If you prefer async/await, use the following
+//
+// module.exports = fp(async function (fastify, opts) {
+//   fastify.decorate('someSupport', function () {
+//     return 'hugs'
+//   })
+// })