Update MegaMenu Application Customizer: Version bump to 1.1.0, localization support added, and unnecessary files removed

- Deleted obsolete localization file for English (en-us).
- Updated version number from 1.0.4 to 1.1.0 in manifests.js and manifests.json.
- Added localization support for German (de-de) in a new localization file.
- Removed unnecessary dependencies from manifests.
- Added .gitignore to exclude build artifacts and temporary files.

lib/extensions/megaMenu/loc/en-us.js

@@ -1,5 +1,7 @@
 define([], function() {
   return {
-    "Title": "MegaMenuApplicationCustomizer"
+    "Title": "MegaMenuApplicationCustomizer",
+    "ConfigurationMissing": "Navigation is not configured.",
+    "LoadError": "Navigation could not be loaded."
   }
-});
+});