Fully automate dev setup with Gitpod #2

Closed gengjiawen closed 3 years ago

This commit implements a fully-automated development setup using Gitpod.io, an online IDE for GitHub and GitLab that enables Dev-Environments-As-Code. This makes it easy for anyone to get a ready-to-code workspace for any branch, issue or pull request almost instantly with a single click.

不太确定，这个是不是小众需求，加入这个主要是可以方便的生成epub格式的图书。

我先merge进自己fork，作者觉得可行，我再打开。