Topotato docs moving current docs to internals

[eznix86]

I moved the docs to internals because it concerns more the internals of Topotato rather than a guide to get started.

Internals might be seperated into two parts:

• Understanding Topotato / Contributing
• References (where one can find the necessary references to what he needs)

Inspired from : https://diataxis.fr/tutorials-how-to/#understanding-the-distinction