Basically it is based on the AstroNvim v4 template. Here you can read more about AstroNvim. I also recommend you to check a LazyVim. It is almost the same thing, but a bit more fancy.
mv ~/.config/nvim ~/.config/nvim.bak
mv ~/.local/share/nvim ~/.local/share/nvim.bak
mv ~/.local/state/nvim ~/.local/state/nvim.bak
mv ~/.cache/nvim ~/.cache/nvim.bak
git clone https://github.com/salfum/nvim ~/.config/nvim
nvim