home: add git config and common module for headless systems

home/common.nix

@@ -0,0 +1,32 @@
+{ config, lib, pkgs, ... }:
+let
+  username = "cazzzer";
+in
+{
+  imports = [
+    ./modules/fish.nix
+    ./modules/git.nix
+  ];
+
+  # Home Manager needs a bit of information about you and the paths it should
+  # manage.
+  home.username = username;
+  home.homeDirectory = "/home/${username}";
+
+  # Let Home Manager install and manage itself.
+  programs.home-manager.enable = true;
+
+  home.sessionVariables = {
+    EDITOR = "micro";
+    SHELL = "fish";
+  };
+
+  # This value determines the Home Manager release that your configuration is
+  # compatible with. This helps avoid breakage when a new Home Manager release
+  # introduces backwards incompatible changes.
+  #
+  # You should not change this value, even if you update Home Manager. If you do
+  # want to update the value, then make sure to first check the Home Manager
+  # release notes.
+  home.stateVersion = "24.11"; # Please read the comment before changing.
+}