refactor(timeline): replace client-side hash navigation with server action createPost that redirects to /#timeline

src/app/timeline/route.ts

@@ -1,3 +1,6 @@
-export const timeline = () => {
-    window.location.hash = '#timeline';
-};
+'use server'
+import { redirect } from 'next/navigation'
+ 
+export async function createPost(id: string) {
+  redirect(`/#timeline`)
+}