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.

05-es6-plus/06-async-await/starter.js

@@ -0,0 +1,15 @@
+function loadConfig() {
+  return new Promise((resolve) => {
+    setTimeout(() => {
+      resolve({
+        title: "现代 JS 面板",
+        level: "进阶",
+      });
+    }, 800);
+  });
+}
+
+// 任务：
+// 1. 写一个 async 函数
+// 2. 用 await 等待 loadConfig()
+// 3. 用 try...catch 处理流程