Home manager not found at store

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Firstly, im extremely sorry for the late reply.

This is what i was trying to setup (add my git username declaratively), so was trying to add them under my home.nix. After adding the programs.git to the home.nix i gave the wrong command as home-manager rebuild instead of nixos-rebuild. then this OP.
so to answer you question, No. its not in git and im kind of stuck way before pushing them, So sorry for the inconvenience. I looked at the example what you have given and im unable to correlate with my existing .nix files. So im adding them here for a ref, (as of now this is the current state all the .nix files and i would like to go modular like they way you do)
flake.nix

{
  description = "Initial Flake";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-23.11";
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";

    # home-manager.url = "github:nix-community/home-manager/release-23.11";
    home-manager.url = "https://github.com/Kareem-Medhat/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { self, nixpkgs, nixpkgs-unstable, home-manager, ... }:
    let
      systemSettings = {
        system = "x86_64-linux";
        hostname = "nixos";
      };
      userSettings = {
        username = "mainuser";
        dotfilesDir = "~/.dotfiles";
      };

      system = systemSettings.system;
      lib = nixpkgs.lib;
      pkgs = nixpkgs.legacyPackages.${systemSettings.system};
      pkgs-unstable = nixpkgs-unstable.legacyPackages.${systemSettings.system};

    in {
    nixosConfigurations = {
      system = lib.nixosSystem {
        system = systemSettings.system;
        modules = [ ./configuration.nix ];
        specialArgs = {
          inherit systemSettings;
          inherit userSettings;
          inherit pkgs-unstable;
        };
      };
    };
    homeConfigurations = {
      userSettings.username = home-manager.lib.homeManagerConfiguration {
        inherit pkgs;
        modules = [ ./home.nix ];
        extraSpecialArgs = {
          inherit systemSettings;
          inherit userSettings;
          inherit pkgs-unstable;
        };
      };
    };
  };
}

my configuration.nix is,

{ config, pkgs, pkgs-unstable, systemSettings, userSettings, ... }:

{
  imports =
    [ ./hardware-configuration.nix ];

  # Bootloader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  # Session Variables
  environment.sessionVariables = {
    FLAKE = "/home/${userSettings.username}/.dotfiles";
  };

  networking.hostName = systemSettings.hostname;

  # Flakes
  nix.settings.experimental-features = [ "nix-command" "flakes" ];

  users.users.${userSettings.username} = {
    isNormalUser = true;
    description = userSettings.username;
    extraGroups = [ "networkmanager" "wheel" ];
    packages = with pkgs; [
      firefox
      kate
    ];
  };

  nixpkgs.config.allowUnfree = true;

  environment.systemPackages =
  (with pkgs; [
    ...
    home-manager
    ...
  ])
  ++
  (with pkgs-unstable; [
    ...
  ]);

  system.stateVersion = "23.05"; # Did you read the comment?
}

And my home.nix is

{ config, pkgs, systemSettings, userSettings,... }:
{
    imports = [
    ./sh/sh.nix
  ];

  #home.username = "mainuser";
  home.username = userSettings.username;
  #home.homeDirectory = "/home/mainuser";
  home.homeDirectory = "/home/${userSettings.username}";
  programs.git = {
    enable = true;
    userName = "";
    userEmail = "";
  };

  home.stateVersion = "23.05";
  home.packages = with pkgs; [
    hello
    emacs
    tmux
    htop
  ];

  home.file = {
  };

im extremely sorry if im asking for more. Im still a beginner and unable to understand atleast bare minimal things from your .nix. to me it looks way too complex. :slightly_frowning_face: