左侧目录树优化，及搜索部分样式调整，部分图片路径更改

shuishen

2021-06-11 95c1f10a276a69ce4fdcc72e68a35c796581d143

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<div>
  <div class="jimu-container" data-dojo-attach-point="containerNode">
      <div class="empty-tip">${nls.emptyDocablePanelTip}</div>
  </div>
  <div class="bar" data-dojo-attach-point="barNode" data-dojo-attach-event="onclick:_onBarClick"></div>
</div>