docs(readme): replace fastify.io links with fastify.dev (#194)

* docs(readme): replace `fastify.io` links with `fastify.dev`

* docs(readme): remove `www.` from `fastify.dev` urls

Author: Fdawgs

README.md

@@ -4,9 +4,9 @@
 [![NPM version](https://img.shields.io/npm/v/@fastify/aws-lambda.svg?style=flat)](https://www.npmjs.com/package/@fastify/aws-lambda)
 [![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](https://standardjs.com/)
 
-Inspired by the AWSLABS [aws-serverless-express](https://github.com/awslabs/aws-serverless-express) library tailor made for the [Fastify](https://www.fastify.io/) web framework.
+Inspired by the AWSLABS [aws-serverless-express](https://github.com/awslabs/aws-serverless-express) library tailor made for the [Fastify](https://fastify.dev/) web framework.
 
-**No use of internal sockets, makes use of Fastify's [inject](https://www.fastify.io/docs/latest/Guides/Testing/#testing-with-http-injection) function.**
+**No use of internal sockets, makes use of Fastify's [inject](https://fastify.dev/docs/latest/Guides/Testing/#testing-with-http-injection) function.**
 
 **Seems [faster](https://github.com/fastify/aws-lambda-fastify#some-basic-performance-metrics)** *(as the name implies)* **than [aws-serverless-express](https://github.com/awslabs/aws-serverless-express) and [aws-serverless-fastify](https://github.com/benMain/aws-serverless-fastify) 😉**
 
@@ -110,7 +110,7 @@ app.get('/', (request, reply) => {
 
 Since [AWS Lambda now enables the use of ECMAScript (ES) modules](https://aws.amazon.com/blogs/compute/using-node-js-es-modules-and-top-level-await-in-aws-lambda/) in Node.js 14 runtimes, you could lower the cold start latency when used with [Provisioned Concurrency](https://aws.amazon.com/blogs/compute/new-for-aws-lambda-predictable-start-up-times-with-provisioned-concurrency/) thanks to the top-level await functionality.
 
-We can use this by calling the [`fastify.ready()`](https://www.fastify.io/docs/latest/Reference/Server/#ready) function outside of the Lambda handler function, like this:
+We can use this by calling the [`fastify.ready()`](https://fastify.dev/docs/latest/Reference/Server/#ready) function outside of the Lambda handler function, like this:
 
 ```js
 import awsLambdaFastify from '@fastify/aws-lambda'