Fix installation bugs

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/user/configs/gui/theme/theme.sh

@@ -1,3 +1,4 @@
+[[ ! -d "${CONFIG}" ]] && mkdir -p "${CONFIG}"
 [[ ! -L "${CONFIG}"/wallpaper ]] && ln -sf "${DEFAULT_WALLPAPER}" "${CONFIG}"/wallpaper
 [[ ! -f "${CONFIG}"/mode ]] && echo "${DEFAULT_MODE}" > "${CONFIG}"/mode
 

hosts/eirene/users/nick.nix

@@ -1,4 +1,4 @@
-{ config, ... }:
+{ config, lib, ... }:
 let
   # FIXME: https://github.com/NixOS/nixpkgs/issues/24570
   # FIXME: https://github.com/NixOS/nixpkgs/issues/305643
@@ -80,7 +80,7 @@ in
     hashedPasswordFile = config.sops.secrets."${user}-password".path;
     extraGroups = [ "wheel" ];
     linger = true;
-    uid = 1000;
+    uid = lib.strings.toInt (builtins.readFile ../../../users/${user}/uid);
   };
 
   services.getty.autologinUser = user;