Fork and clone the repository, cd to the dotfiles directory, then run the install script:

./install.sh

You may need to chmod u+x install.sh if the script isn't already executable.

If your repo is in sync, your dotfiles are in sync. If new dotfiles have been added since the last time you ran the install.sh script, just run it again.

I can't imagine a situation where I'd want to remove all of my dotfiles...

But if you really must, just delete the symlinks and the repo directory and you'll be good.