Encoding infrastructure

[Fris0uman]

Since #54 we test that all sound files are encoded the same, and we have one script from #52 to reencode the file locally.
reencode.zip
Script need ffmpeg and ffprobe as dependency to run

However that script is not in the repo, and has no documentation on how to set it up. It would be nice if someone could either write doc to make it easier to set up locally or made it into a github action that would automatically reencode files when needed.