ask to enable js for search

layouts/_default/search.html

@@ -24,6 +24,14 @@
     <input id="searchInput" autofocus placeholder="{{ .Params.placeholder | default (printf "%s ↵" .Title) }}"
         aria-label="search" type="search" autocomplete="off">
     <ul id="searchResults" aria-label="search results"></ul>
+    <noscript>
+        <style>
+            #searchInput {
+                display: none;
+            }
+        </style>
+        Enable JavaScript to use the search function.
+    </noscript>
 </div>
 
 {{- end }}{{/* end main */}}