config: update more comments

flake.nix

@@ -97,6 +97,7 @@
         # Access to NUR.
         inputs.nur.overlay
 
+        # Running unpatched binaries in NixOS?!!
         inputs.nix-alien.overlays.default
       ];
 

lib/private.nix

@@ -3,6 +3,7 @@
 { lib }:
 
 rec {
+  # This is only used for home-manager users without a NixOS user counterpart.
   mapHomeManagerUser = user: settings:
     let
       homeDirectory = "/home/${user}";

modules/nixos/profiles/filesystem.nix

@@ -1,3 +1,7 @@
+# A bunch of predefined filesystem configurations for several devices. This is
+# nice for setting up shop for certain tasks with the flick of the switch to ON
+# (e.g., `config.profiles.filesystem.archive.enable = true`) and not have
+# conflicting settings all throughout the configuration.
 { config, options, lib, pkgs, ... }:
 
 let

modules/nixos/profiles/i18n.nix

@@ -1,4 +1,6 @@
-# System-wide i18n options.
+# System-wide i18n options. This is primarily used for desktop installations.
+# Unless there is really good reasons for setting i18n options on the server,
+# this module will stay aiming for desktop.
 { config, options, lib, pkgs, ... }:
 
 let

modules/nixos/profiles/server.nix

@@ -1,5 +1,6 @@
 # All of the settings related to server systems. Take note they cannot be used
-# alongside the desktop profile.
+# alongside the desktop profile since there are conflicting configurations
+# between them.
 { config, options, lib, pkgs, ... }:
 
 let