Docs: esm syntax

[zekth]

Adding ESM syntax to examples, as its the modern way to write JS these days.
This covers the main readme and the getting started example. Not sure if the whole documentation needs a patch

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[Eomm]

Just to share, would it be more straightforward for users get a table

esm	cjs
code	code

?

[zekth]

Won't this break the doc website? I will be hard to read on all devices

[RafaelGSS]

Just for curiosity, how the website would looks like with:

ESM

import Fastify from 'fastify'
const fastify = Fastify({
  logger: true
})

Commonjs

const fastify = require('fastify')({
  logger: true
})

?

[mcollina]

lgtm

[RafaelGSS]

LGTM.

[github-actions]

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