Update flake, theme gtk, add vscode cache

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

users/common/options/home-manager/matugen/default.nix

@@ -9,7 +9,7 @@ in
     enable = mkEnableOption "matugen";
     package = mkPackageOption pkgs "matugen" { };
     settings = mkOption {
-      type = attrs;
+      type = attrsOf anything;
       description = "Settings to write to config.toml.";
     };
   };

users/common/options/home-manager/theme/default.nix

@@ -153,10 +153,7 @@ in
     };
 
     mode = mkOption {
-      type = enum [
-        "dark"
-        "light"
-      ];
+      type = enum [ "dark" "light" ];
       default = "dark";
       description = "The default mode of the theme.";
     };