[view history/snapshot/trash file] rewrote them with react

frontend/src/components/file-content-view/markdown.js

@@ -0,0 +1,23 @@
+import React from 'react';
+import MarkdownViewer from '@seafile/seafile-editor/dist/viewer/markdown-viewer';
+
+import '../../css/md-file-view.css';
+
+const { fileContent } = window.app.pageOptions;
+
+class FileContent extends React.Component {
+  render() {
+    return (
+      <div className="file-view-content flex-1 o-auto">
+        <div className="md-content">
+          <MarkdownViewer 
+            markdownContent={fileContent}
+            showTOC={false}
+          />
+        </div>
+      </div>
+    );
+  }
+}
+
+export default FileContent;