misc: add instance banner and consent support

frontend/src/components/page-frames/Banner.tsx

@@ -0,0 +1,17 @@
+/* eslint-disable react/no-danger */
+import DOMPurify from "dompurify";
+
+import { useServerConfig } from "@app/context";
+
+export const Banner = () => {
+  const { config } = useServerConfig();
+
+  // eslint-disable-next-line react/no-danger-with-children
+  return config.pageFrameContent ? (
+    <div className="h-[3vh] w-full text-center">
+      <div dangerouslySetInnerHTML={{ __html: DOMPurify.sanitize(config.pageFrameContent) }} />
+    </div>
+  ) : (
+    <div />
+  );
+};