Use rime-ice in nixpkgs instead of self-packaged

- remove package rime-ice
- remove overlay of rime-ice
- regenerate nvfetcher
- add configuration for rime-ice
- add zhwiki and moegirl as dict

nixos/modules/i18n.nix

@@ -32,11 +32,12 @@ in {
           addons = with pkgs; [
             libsForQt5.fcitx5-qt
             fcitx5-gtk
-            fcitx5-gtk
             fcitx5-fluent
             (fcitx5-rime.override {
               rimeDataPkgs = [
                 rime-ice
+                rime-zhwiki
+                rime-moegirl
               ];
             })
           ];