Hide Alternative Agents nav item

Co-authored-by: openhands <openhands@all-hands.dev>

content.py

@@ -556,6 +556,11 @@ span.wrap[tabindex="0"][role="button"][data-editable="false"] {
     grid-column: 8 !important;
     white-space: nowrap !important;
 }
+/* Hide the Alternative Agents page from the top-level nav for now. */
+.nav-holder nav a[href*="alternative-agents"] {
+    display: none !important;
+}
+
 /* Divider line between header and category nav */
 .nav-holder nav::after {
     content: ''; /* Required for pseudo-elements to appear */