GitLab

* [Docs] Fix sphinx version

* [Docs] Remove sphinx_markdown_tables

* update readme link

* add sphinx_rtd_theme package

* [Docs] Refactor documentation

* [Docs] Refactor documentation

* refactor docs

* refactor docs

* set sphinx==3.1.2

* fix typo

* modify according to comment

* modify according to comment

* modify according to comment

* [Docs] delete unnecessary file

* fix title

* rename

* rename

* support pytorch 1.7 and update the CI

* fix CI

* fix onnxruntime version in macos

* Rewrite readme.rst by markdown

* Update setup.py

* Update mmcv links

* clean code

* Add logo

* Resolve comments

* clean unnecessary code change