[FEATURE] - Save the last known state to .dots for a clean symlink removal

[oknozor]

Let's say we have the following entry installed :

sway = { source = "sway", target = ".config/sway" }

This is linked like this :

# $HOME/.config
sway -> /home/user/dotfiles/.dots/sway

Now we change our sway entry to :

i3 = { source = "i3", target = ".config/i3" }

And run bombadil link.

Doing this we are left with a dangling $HOME/.config/sway symlink.

Since it's not possible to find symlinks from the target file, one way to solve this would be to add a .dots/.state.toml file on
linking. This files would contain a Map(source -> target). Allowing to check for link to removes, even if the config as changed.