feat: add electron app.

website/src/commands/title.tsx

@@ -0,0 +1,25 @@
+import React from 'react';
+import { ICommand } from '@uiw/react-markdown-editor';
+import styled from 'styled-components';
+import { ReactComponent as ColorIcon } from '../assets/color.svg';
+
+const Title = styled.div`
+  font-size: 0.9rem;
+  font-weight: bold;
+  display: flex;
+  align-items: center;
+  line-height: 1;
+  padding-right: 0.5rem;
+  padding-left: 0.2rem;
+`;
+
+export const themeTitle: ICommand = {
+  name: 'themeTitle',
+  keyCommand: 'themeTitle',
+  button: () => (
+    <Title>
+      <ColorIcon width={16} height={16} />
+      主题编辑器
+    </Title>
+  ),
+};