生成侧边栏和readme

HTML/README.md

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+## HTML
+

HTML/_sidebar.md

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+## HTML
+- HTML
+  - html5
+    - [baidu-map](HTML/html5/baidu-map.md)
+    - [canvas](HTML/html5/canvas.md)
+    - [drag-and-drop](HTML/html5/drag-and-drop.md)
+    - [html5-form](HTML/html5/html5-form.md)
+    - [html5-introduce](HTML/html5/html5-introduce.md)
+    - [html5-svg](HTML/html5/html5-svg.md)
+    - [video-and-audio](HTML/html5/video-and-audio.md)
+    - [web-sockets](HTML/html5/web-sockets.md)
+    - [web-storage](HTML/html5/web-storage.md)
+    - [web-workers](HTML/html5/web-workers.md)
+  - html5-basics
+    - [first-html](HTML/html5-basics/first-html.md)
+    - [html-basics-element](HTML/html5-basics/html-basics-element.md)
+    - [html-form](HTML/html5-basics/html-form.md)
+    - [html-introduce](HTML/html5-basics/html-introduce.md)
+    - [html-list](HTML/html5-basics/html-list.md)
+    - [html-table](HTML/html5-basics/html-table.md)
+    - [image-element](HTML/html5-basics/image-element.md)
+    - [link-element](HTML/html5-basics/link-element.md)