fix: revert redirect to hidden vercel URL

Author: aeneasr

vercel.json

@@ -27,18 +27,6 @@
       ],
       "permanent": true
     },
-    {
-      "source": "/docs/:path*",
-      "destination": "https://www.ory.com/docs/:path",
-      "has": [
-        {
-          "type": "header",
-          "key": "host",
-          "value": "docs-ory.vercel.app"
-        }
-      ],
-      "permanent": false
-    },
     {
       "source": "/keto/docs/(|v0.5/)engines",
       "destination": "https://github.com/ory/keto/blob/v0.7.0-alpha.1/docs/versioned_docs/version-v0.5/engines/index.md",