feat: add TypeScript lessons and learning panel

- Introduced a new script to check TypeScript lesson files for errors.
- Created a main TypeScript file to render lessons and their details.
- Added lesson definitions with starter and answer codes.
- Implemented a user interface for navigating and running lessons.
- Styled the application with CSS for a better user experience.
- Updated README to reflect the new TypeScript section and usage instructions.

04-dom-events-async/03-create-and-remove/starter.js

@@ -0,0 +1,4 @@
+// 任务：
+// 1. 获取新增按钮、删除按钮和列表
+// 2. 点击新增按钮时创建一个新的 li 并追加到列表
+// 3. 点击删除按钮时删除最后一个 li