Clone to ~\AppData\Local\nvim for Windows and ~/.config/nvim on linux.
Use the common ~/.vimrc.
https://www.jetbrains.com/help/idea/using-product-as-the-vim-editor.html
On Windows $HOME/.ideavimrc, just let it source ~/.vimrc.
For fzf on Raspbian, download ARMv7 release from https://github.com/junegunn/fzf/releases
Add export FZF_DEFAULT_COMMAND='rg --files' to your bashrc file.
sudo apt install snapd
sudo reboot
sudo snap install core
sudo snap install nvim --classic
# sudo apt remove nvim
Add the VsVim plugin and configure it to use ~/.vsvimrc due to some unsupported options.