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/MegaMenu.module.scss.d.ts

@@ -1,5 +1,2 @@
-declare const styles: {
-    mmSlideIn: string;
-    mmFadeIn: string;
-};
+declare const styles: {};
 export default styles;