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.js

@@ -1,9 +1,6 @@
 /* tslint:disable */
 require('./MegaMenu.module.css');
-var styles = {
-    mmSlideIn: 'mmSlideIn_09a8e1a7',
-    mmFadeIn: 'mmFadeIn_09a8e1a7',
-};
+var styles = {};
 export default styles;
 /* tslint:enable */