Store database of information about what is currently linked

[SlyCedix]

Presently, it seems that tuckr uses the current structure of the dotfiles directory to determine what to remove upon using tuckr rm <group>. An issue arises when a group is changed structurally:

If one decides to relocate their bin group, for example, from $HOME/bin to $HOME/.local/bin. If the user did not run tuckr rm bin prior to making this change, tuckr has no way of knowing that there is even a link at $HOME/bin in the first place.

This is also an issue if a user deletes a file from the dotfiles without unlinking the group first as well.

This may work well as an addition #43, since the file tree could be serialized/deserialized with serde. This would also allow difference checking to notify the user if the current stucture matches or differs from the correct structure, perhaps with a tuckr fix <groups> command to remove orphaned links and create new links.