add: PageIndex 컴포넌트에 대한 스토리 작성

src/stories/PageIndex.stories.jsx

@@ -0,0 +1,15 @@
+import { useState } from "react";
+import PageIndex from "../components/common/PageIndex";
+
+export default {
+  title: "Common/PageIndex",
+  component: PageIndex,
+  tags: ["autodoc"],
+};
+
+const Template = () => {
+  const [page, setPage] = useState(1);
+  return <PageIndex {...{ page, setPage }} />;
+};
+
+export const Default = Template.bind({});