neovim-flake/docs/manual/installation.md

Installing neovim-flake

There are multiple ways of installing neovim-flake on your system. You may either choose the standalone installation method, which does not depend on a module system and may be done on any system that has the Nix package manager or the appropriate modules for NixOS and home-manager as described in the module installation section

installation/custom-configuration.md
installation/modules.md