Teachbooks

What's Changed

Added `clean` CLI option that does two things:
1. check if a Teachbooks server is running and shut it down
2. run `jupyter book clean <dir>`

This avoids the annoying error that happens when running `jupyter book clean book` if a teachbooks server was active.

* Teachbooks clean by junwon1022 in https://github.com/TeachBooks/TeachBooks/pull/24


**Full Changelog**: https://github.com/TeachBooks/TeachBooks/compare/v0.0.4...v0.0.5

Replaced --publish by --release

What's Changed
* Added release option by junwon1022 in https://github.com/TeachBooks/TeachBooks/pull/23
* Update README.md by Tom-van-Woudenberg in https://github.com/TeachBooks/TeachBooks/pull/25
* more docs update by Tom-van-Woudenberg in https://github.com/TeachBooks/TeachBooks/pull/26

New Contributors
* junwon1022 made their first contribution in https://github.com/TeachBooks/TeachBooks/pull/23
* Tom-van-Woudenberg made their first contribution in https://github.com/TeachBooks/TeachBooks/pull/25

**Full Changelog**: https://github.com/TeachBooks/TeachBooks/compare/v0.0.3...v0.0.4

Rename the hidden working directory to `.teachbooks`.

Adds server functionality and testing infrastructure.