[Chore] Add a note for experimental feature globalSync.

Remove comments.
Set version to tauri.conf.json(3.0.0 is just restore from pre-checkout develop branch, though.)

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
     "$schema": "https://schema.tauri.app/config/2",
     "productName": "VRCT",
-    "version": "0.1.0",
+    "version": "3.0.0",
     "identifier": "com.vrct.app",
     "build": {
         "beforeDevCommand": "",