Add wallet/index redirect (#1849)

Author: alexandratran

Diff for: vercel.json

@@ -10,6 +10,10 @@
       "source": "/guide/:path*/",
       "destination": "/wallet/"
     },
+    {
+      "source": "/wallet/index/",
+      "destination": "/wallet/"
+    },
     {
       "source": "/wallet/category/get-started/",
       "destination": "/wallet/"