GitLab

* add doc for mmcv installation

* Update docs/en/get_started/build.md
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* [Docs] Add more windows information in README

* minor fix

* rename MacOS to macOS

* Reorganizing OpenMMLab projects in readme

* Update README.md

* Reorganizing OpenMMLab projects in readme

Reorganizing OpenMMLab projects in readme

* fix typo

* fix typo
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* Add mmrotate link in README.md

* Add mmrotate link in docs

* fix isort

* [Improve] build using ninja

* [Refactor] refactor requirements

* [Improve] imporve docs

* [Fix] fix file name

* Add the link of mmrazor

* Add the link of mmrazor

* [Docs] Refactor the structure of documentation

* [Docs] Refactor the structure of documentation

* fix symlink

* fix link

* fix typo

* polish docstring

* fix docstring