chore: add fly config & move to npm

app/entry.client.tsx

@@ -0,0 +1,12 @@
+import { startTransition, StrictMode } from "react";
+import { hydrateRoot } from "react-dom/client";
+import { HydratedRouter } from "react-router/dom";
+
+startTransition(() => {
+  hydrateRoot(
+    document,
+    <StrictMode>
+      <HydratedRouter />
+    </StrictMode>
+  );
+});