* Support config to disable new user send message
* Disable new user send message logic
* Support get system config
* Let new user as register from last year
* Refactor as monorepo
* Fix server
* Fix client
* Fix not fire message event error
* Fix CI scripts
* Update install doc
* Fix bin
* Refactored the directory structure to the final version
* Fix ts type error
* Fix lint error
* Fix unit test error
* Update .gitignore