Using host-dotfiles is simple.
Simply
$ cd host-dotfiles
$ ./install.sh
This will remove all the dotfiles in your home directory and add new ones which link to the dotfiles contained in ./runcoms.
The old dotfiles are automatically backed up into ./runcoms_old and timestamped.
To edit the rc files, simply edit them as you would a normal dotfile; the linking will obviously make the changes to the file contained in host-dotfiles/runcoms