feat: improve frontend (#387)

* fork

* fork

* chore: update style

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Co-authored-by: JustSong <songquanpeng@foxmail.com>

web/src/components/OtherSetting.js

@@ -112,7 +112,7 @@ const OtherSetting = () => {
           <Form.Group widths='equal'>
             <Form.TextArea
               label='公告'
-              placeholder='在此输入新的公告内容'
+              placeholder='在此输入新的公告内容，支持 Markdown & HTML 代码'
               value={inputs.Notice}
               name='Notice'
               onChange={handleInputChange}