feat: simplify flake.nix

home/linux/server.nix

@@ -1,6 +1,4 @@
-{ ... }:
-
-{
+{ username, ... }: {
   imports = [
     ../base/server
 
@@ -9,12 +7,9 @@
 
   # Home Manager needs a bit of information about you and the
   # paths it should manage.
-  home = let
-    name = "ryan";
-  in
-  {
-    username = name;
-    homeDirectory = "/home/${name}";
+  home = {
+    username = username;
+    homeDirectory = "/home/${username}";
 
     # This value determines the Home Manager release that your
     # configuration is compatible with. This helps avoid breakage