Improved build system

[humbertovnavarro]

The build system seems a little convoluted and I feel like there could be some big improvements made there. Maybe take advantage of nix? Migrate to platform io?

[AlexLynd]

@humbertovnavarro @MichaelPachec0 is working on a Nix flake 😛 . Build process will also be moved to a separate repo that other firmwares can take advantage of