Add vercel.json for static site deployment

Vercel was failing because it detected Cargo.toml and didn't know
how to build the project. This config tells Vercel to serve the
root directory as a static site with no build step.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sidmohan0

vercel.json

@@ -0,0 +1,8 @@
+{
+  "buildCommand": "",
+  "outputDirectory": ".",
+  "framework": null,
+  "rewrites": [
+    { "source": "/(.*)", "destination": "/index.html" }
+  ]
+}