Incorrect "Sorry, page not found"

[todd mitton]

The search page incorrectly says "Sorry, page not found" when waiting for
search results.  This patch displays a rotating cog instead.

Thanks,
-Todd

diff --git a/custom-theme/search.html b/custom-theme/search.html
index e1e36be..6df54f1 100644
--- a/custom-theme/search.html
+++ b/custom-theme/search.html
@@ -13,7 +13,9 @@
   </form>

   <div id="mkdocs-search-results">
-    Sorry, page not found.
+    <div>
+      <i class="fa fa-cog fa-spin fa-4x"></i>
+    </div>
   </div>

 {% endblock %}