blog/vercel.json

{
  "redirects": [
    {
      "source": "/posts/:path",
      "destination": "/writing/:path",
      "permanent": true
    },
    {
      "source": "/post/:path",
      "destination": "/writing/:path",
      "permanent": true
    },
    {
      "source": "/friends",
      "destination": "/links",
      "permanent": true
    }
  ]
}