chore(website): reimplement download button

apps/website3/src/components/DownloadButton.tsx

@@ -0,0 +1,17 @@
+import { useLayoutEffect } from "preact/hooks";
+import { getRecommendedDownload } from "../download-helper";
+
+interface DownloadButtonProps {
+    big?: boolean;
+}
+
+const { architecture, platform, url } = getRecommendedDownload();
+
+export default function DownloadButton({ big }: DownloadButtonProps) {
+    return (
+        <a className={`download-button ${big ? "big" : ""}`} href={url}>
+            Download now{" "}
+            <span class="platform">{platform} {architecture}</span>
+        </a>
+    )
+}