Add js web stuff to landing page + documentation

go/jsruntime/hooks/useDocumentTitle.js

@@ -0,0 +1,20 @@
+import { createEffect, onCleanup } from "solid-js";
+
+const SITE_NAME = "National CD Rateline";
+
+export function createDocumentTitle(title) {
+    createEffect(() => {
+        const previousTitle = document.title;
+        const t = title();
+        document.title = t ? `${t} | ${SITE_NAME}` : SITE_NAME;
+
+        onCleanup(() => {
+            document.title = previousTitle;
+        });
+    });
+}
+
+export function PageWithTitle(props) {
+    createDocumentTitle(() => props.route.title || props.route.label);
+    return props.children;
+}