Docs re-structure

[patrick91]

This is a draft for a better structure for the docs, feel free to come up with suggestions:

1. Getting Started

   • Installation
   • Editor Setup
   • Hello world

2. Core concepts

   • ...

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[brunodantas]

Suggestion: there is some good info in the PyCon workshop page that could be integrated into the docs. See https://github.com/strawberry-graphql/strawberry.rocks/issues/483