Implementa novo setup

[trevineju]

O build da documentação passou a falhar com a seguinte mensagem:

Your builds will stop working soon! "build.image" config key is deprecated and it will be removed soon. Read our blog post to know how to migrate to new key "build.os" and ensure your project continues building successfully.

Your builds will stop working soon! Configuration files will soon be required by projects, and will no longer be optional. Read our blog post to create one and ensure your project continues building successfully.

Error The configuration file required to build documentation is missing from your project. Add a configuration file to your project to make it build successfully. Read more at https://docs.readthedocs.io/en/stable/config-file/v2.html

Esta PR resolve o problems:

• adiciona o arquivo .readthedocs.yaml
• sobe todos os arquivos .rst para um nível acima da hierarquia (o diretório /source não mais existe, todos os .rst ficam diretamente em /docs)