GitLab

* [Docs] Simplify README

* Simplify README_zh-CN

* Update installation docs

* Add mmyolo link in README

* update introduction

* update installation

* Update build docs

* remove io link in README

* update

* [Docs] Refactor the api structures of docs

* refine api structures of docs

* Update zh_cn

* update branch

* [Docs] Refactor the structure of documentation

* [Docs] Refactor the structure of documentation

* fix symlink

* fix link

* fix typo

* polish docstring

* fix docstring