If it's set in `languages.toml`, I don't seem to able to actually
toggle it, so let's just nuke it and allow the toggling

presenterm is cool, but a bit too hipster for most things I need in life

I don't think rustup needs to be added manually and manpath wasn't
being set properly. This does result in double-adding Homeberw to the
path (at least on Linux), but I think that's probably better

It wasn't used and wasn't configured properly