Refactor docs

[rafaellehmkuhl]

• Remake the HTML pages, including links and structure.

• Add docstrings to GPSController

• Add docstrings to Nano

• Add docstrings to Pitot (init)

• Add docstrings to ultrassom

• Make the code to follow PEP8 directives

• Change the variables, classes and functions to english (?)

• Change docstrings format from sphinx to google

• Add doc pages with instructions on how to setup the platform

• Remake Modules page on docs