[bug fix] Don't initialize search when disabled

fix #253

layouts/partials/head/scripts.html

@@ -558,6 +558,8 @@
     var searchMenu = null;
     var searchText = null;
     
+    {{ $enableSearch := ($.Param "enableSearch") }}
+    var enableSearch = JSON.parse({{ $enableSearch | jsonify }});
     {{ $enableSearchHighlight := ($.Param "enableSearchHighlight") }}
     var enableSearchHighlight = JSON.parse({{ $enableSearchHighlight | jsonify }});
     {{ $searchResultPosition := ($.Param "searchResultPosition") }}
@@ -567,6 +569,7 @@
 
     var fuse = null;
     
+    if (enableSearch) {
       (function initFuse() {
         var xhr = new XMLHttpRequest();
         xhr.open('GET', baseurl + "/index.json");
@@ -591,6 +594,7 @@
         };
         xhr.send();
       })();
+    }
 
     function makeLi(ulElem, obj) {
       var li = document.createElement('li');