refactor(flake, system): improve code structure

Refactor configuration generation

- Inherit lib from nixpkgs
- Rename functions (mkHome -> makeHome, merge -> forEachHost
- Relocate some variables' definitions into config generator functions
- Create separate function to track home-manager modules

system/common.nix

@@ -84,8 +84,4 @@ in
       tappingDragLock = false;
     };
   };
-
-
-  # Something important
-  system.stateVersion = "24.05";
 }

system/maidena.nix

@@ -1,13 +1,4 @@
 {
-  inputs,
-  config,
-  pkgs,
-  lib,
-  ...
-}:
-{
-  networking.hostName = "maidena";
-
   services = {
     desktopManager.plasma6.enable = true;
     displayManager.sddm = {

system/tokishiko.nix

@@ -1,12 +1,4 @@
 {
-  inputs,
-  config,
-  pkgs,
-  lib,
-  ...
-}:
-{
-  networking.hostName = "tokishiko";
   console.keyMap = "no";
 
   services = {