Add AboutPage component and integrate sorting options in resource retrieval

frontend/src/pages/about_page.tsx

@@ -0,0 +1,10 @@
+import Markdown from "react-markdown";
+import {app} from "../app.ts";
+
+export default function AboutPage() {
+  return <article className={"p-4"}>
+    <Markdown>
+      {app.siteInfo}
+    </Markdown>
+  </article>
+}