Cannot find your emacs configuration using emacs-overlay in home-manager

Hi I came across your github nix-config from this link you posted in nixos discourse https://discourse.nixos.org/t/how-to-use-the-emacs-overlay-with-home-manager-and-flakes/17261/3 . I could not find the related emacs configuration in your repository. I also noticed you have doomDir with doom emacs files. Did you switch to doom emacs by any chance. I could not find the related nix file for that either. Could you help me out? It would be really appreciated. I am in a debian-based distro so I ended up installing home-manager and flake in the standalone form. I tried using the emacs-overlay example that used environment.systemPackages but I replaced that with home.packages. It installed everything but my configuration doesn't load properly.