feat: add intentional reader routes

src/routes/index.tsx

@@ -1,13 +1,7 @@
-import { createFileRoute } from '@tanstack/react-router'
+import { createFileRoute, redirect } from '@tanstack/react-router'
 
-export const Route = createFileRoute('/')({ component: Home })
-
-export function Home() {
-  return (
-    <main className="landing">
-      <p className="brand">TWITTER LITE</p>
-      <h1>目的を決めてから開く</h1>
-      <p>ユーザー名か検索語を入力するまで、投稿は表示しません。</p>
-    </main>
-  )
-}
+export const Route = createFileRoute('/')({
+  beforeLoad: () => {
+    throw redirect({ to: '/user', search: { target: '' } })
+  },
+})