Sambaboy

My PR was by no means intended as a straight merge into the Fastify's Docs master repo. It is merely guidelines to the docs' guru in rethinking how to organize.

Yes, Matteo, agree with you it’s too scattered and consolidation in one place would be good. Agree with Manuel’s addition of Plugin chapter. From the start tell what is meant...

Speaking as a tech writer, the quad section structure vrushti-mody is a good conceptual prompt. Agree w/ mcollina that the Gatsby is a good framework. "Quick Start" is good way...