add routes

Author: avoonix

vercel.json

@@ -2,6 +2,10 @@
   "redirects": [
     { "source": "/", "destination": "https://material-e621.avoonix.com/", "statusCode": 301 }
   ],
+  "routes": [
+    { "handle": "filesystem" },
+    { "src": "/(.*)", "dest": "/index.html" }
+  ],
   "headers": [
     {
       "source": "/assets/(.*)",