refactor: Use haumea for filesystem-based module system for flake outputs

refactor: Use hyphen(`-`) for variable names & folder names(except Python), replace all unserscore(`_`) with hyphen(`-`).

modules/darwin/security.nix

@@ -1,9 +1,9 @@
 {
   config,
-  username,
+  myvars,
   ...
 }: let
-  homeDir = config.users.users."${username}".home;
+  homeDir = config.users.users."${myvars.username}".home;
 in {
   # https://github.com/LnL7/nix-darwin/blob/master/modules/programs/gnupg.nix
   # try `pkill gpg-agent` if you have issues(such as `no pinentry`)

modules/darwin/users.nix

@@ -1,7 +1,7 @@
-{username, ...}: {
+{myvars, ...}: {
   # Define a user account. Don't forget to set a password with ‘passwd’.
-  users.users."${username}" = {
-    home = "/Users/${username}";
+  users.users."${myvars.username}" = {
+    home = "/Users/${myvars.username}";
 
     # set user's default shell back to zsh
     #    `chsh -s /bin/zsh`

modules/darwin/wm/skhd.nix

@@ -1,6 +1,6 @@
 {
   config,
-  username,
+  myvars,
   ...
 }: {
   services.skhd = {
@@ -10,7 +10,7 @@
 
   # custom log path for debugging
   launchd.user.agents.skhd.serviceConfig = let
-    homeDir = config.users.users."${username}".home;
+    homeDir = config.users.users."${myvars.username}".home;
   in {
     StandardErrorPath = "${homeDir}/Library/Logs/skhd.stderr.log";
     StandardOutPath = "${homeDir}/Library/Logs/skhd.stdout.log";

modules/darwin/wm/yabai.nix

@@ -2,11 +2,11 @@
   pkgs,
   config,
   lib,
-  username,
+  myvars,
   pkgs-unstable,
   ...
 }: let
-  homeDir = config.users.users."${username}".home;
+  homeDir = config.users.users."${myvars.username}".home;
 in {
   # https://github.com/NixOS/nixpkgs/blob/nixos-unstable/pkgs/os-specific/darwin/yabai/default.nix
   services.yabai = {