Naive instructions so that I remember:

Prompt

mkdir -p ~/.myscripts
ln -srf fancy-bash.sh ~/.myscripts/

Bashrc

ln -srf bashrc.sh ~/.bashrc

Aliases

ln -srf bash_aliases.sh ~/.bash_aliases
ln -srf bash_aliases.d ~/.bash_aliases.d

Completion rules

ln -srf bash_completion.sh ~/.bash_completion

Complete aliases

sudo apt install bash-completion
git clone https://github.com/cykerway/complete-alias ~/.complete-alias
cd ~/.complete-alias
git checkout 3fc67e8

Profile

ln -srf profile ~/.profile

Inputrc - i.e. to auto complete previous commands.

ln -srf inputrc /etc/inputrc