refs #276: Enable to select highlight.js style

WIP
create select form

lib/views/admin/customize.html

@@ -143,6 +143,29 @@
       </fieldset>
       </form>
 
+      <form action="/_api/admin/customize/highlight" method="post" class="form-horizontal" id="cutomhighlightSettingForm" role="form">
+        <fieldset>
+          <legend>ハイライト設定</legend>
+          <div class="form-group">
+            <div class="col-xs-3">
+              <select class="form-control" id="number" name="number">
+                <option value="github" selected="selected">Github</option>
+                <option value="atom-one-dark">Atom One Dark</option>
+                <option value="atom-one-light">Atom One Light</option>
+              </select>
+            </div>
+          </div>
+
+          <div class="form-group">
+            <div class="col-xs-offset-5 col-xs-6">
+              <input type="hidden" name="_csrf" value="{{ csrf() }}">
+              <button type="submit" class="btn btn-primary">更新</button>
+            </div>
+          </div>
+
+        </fieldset>
+        </form>
+
 
       <form action="/_api/admin/customize/features" method="post" class="form-horizontal" id="customfeaturesSettingForm" role="form">
       <fieldset>