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.

config/package-solution.json

@@ -3,11 +3,11 @@
   "solution": {
     "name": "mega-menu-client-side-solution",
     "id": "f4660e06-ce08-43ee-bfb7-5c4464e01133",
-    "version": "1.0.0",
+    "version": "1.1.0.0",
     "includeClientSideAssets": true,
-    "skipFeatureDeployment": true
+    "skipFeatureDeployment": false
   },
   "paths": {
     "zippedPackage": "solution/mega-menu.sppkg"
   }
-}
+}