I typically clone this and a corresponding repo with "private" stuff to a couple of directories in my home directory, like say ".dotfiles-public" and ".dotfiles-private", then I'll symlink the various files into my home directory.
For the bash config, I'll add something like this to my ~/.bash_profile:
if [ -f "${HOME}/.dotfiles-public/bash-customizations.sh" ]; then
#shellcheck source=$HOME/.dotfiles-public/bash-customizations.sh
source "${HOME}/.dotfiles-public/bash-customizations.sh"
fi