refactor: change flag file to server-side and update page component to client-side

Author: py-dev-nandini-12

src/app/flags.ts

@@ -1,3 +1,5 @@
+"use server";
+
 import { flag } from "flags/next";
 
 export const weatherWidgetFlag = flag({

src/app/page.tsx

@@ -1,5 +1,3 @@
-"use client";
-
 import { useEffect, useState } from "react";
 import { weatherWidgetFlag } from "./flags";