* [Fix] README for mmseg 1.x

* typo

* link and refine

* [WIP] Refine documentation

* get started done

* config refine

* train_test

* refine user guides

* add contribution

* add contribution

* refine visualization

* advanced tutorial

* advanced guides

* tricks

* refine zh doc

* refactor changelog

* [Doc] MMSeg 1.x Documentation

* revise index

* [WIP] Data configuration

* [Doc] Add data configuration

* version info

* grammar

* typo

* typo

* format

* fix based on comments

* grammar

* comments

* [Docs] Add MultiImageMixDataset tutorial

* modify to randommosaic

* fix markdown

* merge docs/ and docs_zh-CN/

* merge docs/ and docs_zh-CN/

* merge docs/ and docs_zh-CN/

* merge docs/ and docs_zh-CN/

* fix launch utility url

* fix launch utility url

* fix wrong pytorch doc url

* remove wrong links docs//

* Improve docs style

* update lists

* update the size of image

* modify duplicate mmdet3d

* refactor docs

* add docs

* add modelzoo

* refactor getting started

* [Improvement] Add markdown linter and fix linting errors

* fixed pip