Revert "begin with v3 tutorial"

This reverts commit 7174127.

Author: enisdenjo

website/src/pages/v3/_meta.json

@@ -2,6 +2,5 @@
   "index": "Quick Start",
   "features": "Features",
   "integrations": "Integrations",
-  "tutorial": "Tutorial",
   "migration": "Migration"
 }