Ixion: Remove , to make search accessible via keyboard. Fixes #498.

ixion/style.css

@@ -1753,7 +1753,6 @@ object {
 	transition: 0.3s ease;
 	padding-left: 0;
 	width: 0;
-	visibility: hidden;
 }
 .site-header .search-form:hover .search-field,
 .site-header .search-field:focus {