Recommend to use a plugin for generating "Treeview" for each article in the book

[aleen42]

gitbook-treeview is a Gitbook plugin designed for generating structures for articles of a book. As the following picture shown, the main structure of a whole article has been clearly shown before contents, and each title has also been directed to a corresponding part. Front-end Handbook is a large book, which has integrated with Gitbook, and I hope that the plugin can helps to enhance readability. If you like it, I hope you can star my project too, and thanks for your appreciations. As for the picture, it's an article named "Asynchronous Programming" in my personal wiki book.