update vercel.json functions

Author: mfix22

vercel.json

@@ -4,5 +4,13 @@
   "public": true,
   "github": {
     "autoAlias": false
+  },
+  "functions": {
+    "pages/api/image/**/*.js": {
+      "maxDuration": 10
+    },
+    "pages/api/snippets/**/*.js": {
+      "maxDuration": 5
+    }
   }
 }