Add support to manange configuration files (w/ directory support)

[TheRealKeto]

Stow, in many instances, is used to manage configuration files (referred to as dotfiles) with the --dotfiles flag. While this alternative doesn't have this flag yet, it would be nice to have it support modern configuration workflows.

Referring to modern configuration workflows, many individuals who've used Stow to manage their configuration files use the acceptable convention of prefixing files with the dot- prefix instead of using . (e.g dot-gitconfig -> .gitconfig). This allows for the file to not be hidden when the contents of a directory are viewed, but ultimately work correctly when stowing.

However, the current implementation of --dotfiles in Stow doesn't work with directories. For instance, a Stow package structured the following way will lead to an error when using the --dotfiles flag.

.
└── lsd
    └── dot-config
        └── lsd
            └── config.yaml

However, if the dot-config folder is renamed to .config, Stow works

.
└── lsd
    └── .config
        └── lsd
            └── config.yaml

This would ultimately make this alternative support a much more modern convention with a feature that the original simply doesn't have, aggregating to the all the other reasons to use this alternative.