Athena V2 iteration v18

This is the current version of Athena V2.0. The rocket is actively stabilized thanks to its thrust vectoring control (TVC) system and its Andromeda avionics. For more information visit the [website](https://www.hephaestus.space). On GitHub you will find the files for the "Andromeda" PCB, so that you can download it and try the project yourself. Unfortunately for legal reasons I cannot share the code, but it is still well explained how it works on our website https://www.hephaestus.space This version has been exposed at the Maker Faire Rome 2021. Maker: Christian Ferracane, Hephaestus Rocketry Team CEO