Better vercel routes

vercel.json

@@ -2,12 +2,29 @@
   "buildCommand": "npm run build:vercel:dist && npm run build:vercel:functions",
   "installCommand": "npm install --no-fund --no-audit",
   "rewrites": [
-    { "source": "/prerender-user-profile-page", "destination": "/404" },
+    {
+      "source": "/package.json",
+      "destination": "/404",
+      "comment": "Disallow accessing /package.json"
+    },
+    {
+      "source": "/prerender-user-profile-page",
+      "destination": "/404",
+      "comment": "Disallow accessing prerender-user-profile-page serverless function directly"
+    },
     { "source": "/submissions", "destination": "https://backend.codecrafters.io/submissions" },
     { "source": "/submissions/:match*", "destination": "https://backend.codecrafters.io/submissions/:match*" },
     { "source": "/progress/:match*", "destination": "https://backend.codecrafters.io/progress/:match*" },
-    { "source": "/users/:username", "destination": "/prerender-user-profile-page" },
-    { "source": "/:path*", "destination": "/_empty.html" }
+    {
+      "source": "/users/:username",
+      "destination": "/prerender-user-profile-page",
+      "comment": "Rewrite user profile pages to prerender-user-profile-page serverless function"
+    },
+    {
+      "source": "/:path*",
+      "destination": "/_empty.html",
+      "comment": "Rewrite everything else to /_empty.html"
+    }
   ],
   "redirects": [
     {
@@ -25,10 +42,6 @@
     {
       "source": "/setup_team",
       "destination": "https://backend.codecrafters.io/setup_team"
-    },
-    {
-      "source": "/package.json",
-      "destination": "/"
     }
   ],
   "github": {