Update app name to 'Nextcloud Notes'

- Changed productName from 'nextcloud-notes-tauri' to 'Nextcloud Notes'
- Updated identifier to 'com.davidrelich.nextcloud-notes'
- App will now show as 'Nextcloud Notes' in macOS Applications
- DMG and .app bundle will use proper name

src-tauri/tauri.conf.json

@@ -1,8 +1,8 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
-  "productName": "nextcloud-notes-tauri",
+  "productName": "Nextcloud Notes",
   "version": "0.1.0",
-  "identifier": "com.davidrelich.nextcloud-notes-tauri",
+  "identifier": "com.davidrelich.nextcloud-notes",
   "build": {
     "beforeDevCommand": "npm run dev",
     "devUrl": "http://localhost:1420",