chore(madara): remove Gatemanga source (AR) - site suspended

dart/manga/multisrc/madara/src/gatemanga/gatemanga.dart

@@ -1,14 +0,0 @@
-import '../../../../../../model/source.dart';
-
-Source get gatemangaSource => _gatemangaSource;
-Source _gatemangaSource = Source(
-  name: "Gatemanga",
-  baseUrl: "https://gatemanga.com",
-  lang: "ar",
-  isNsfw: false,
-  typeSource: "madara",
-  iconUrl:
-      "https://raw.githubusercontent.com/kodjodevf/mangayomi-extensions/main/dart/manga/multisrc/madara/src/gatemanga/icon.png",
-  dateFormat: "d MMMM، yyyy",
-  dateFormatLocale: "ar",
-);