* change pre-commit-config

* modify docs with pre-commit hook

* change pre-commit-config-zh-cn

* fallback readme.md

Co-authored-by: HAOCHENYE <21724054@zju.edu.cn>

* [WIP] Refactor-docs-structure

* [Docs] Check link and fix rst  (#498)

* check link

* fix rst

* Fix conf.py

* Fix lint

* minor refine

* minor refine

* modify zh_readme and index.rst

* add migration exampls get_started design to en

* add tutorials to en

* correct chinese doc link

* Apply suggestions from code review

* Update docs/en/advanced_tutorials/distributed.md

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

Co-authored-by: Mashiro <57566630+HAOCHENYE@users.noreply.github.com>

* [Docs] Make API of docs clearer

* minor fix

* fix md format

* simpify logging tutorials

* minor refine

* minor refine

* refine index.rst

* fix as comment

* add description of by_epoch

* add log processor description

* minor refine

* minor refine

* Fix as comment

* Fix as comment

* refine metric/evaluator doc

* resolve comments

* resolve comments

* Add Visualizer tutorials

* Add Visualizer designs

* update

* update

* update

* fix commit

* add demo image

* simplify code according to #440 and add some results picture

* replace image url

* update

Co-authored-by: liukuikun <liukuikun@sensetime.com>

* Move the design of hook to design/hook.md

* add relative links in docs

* update docstring of hooks

* refine checkpointhook docs

* refine

* fix comments

* refine

* add logging.md link in hook.md

* resolve comments

* fix typo

* [Doc] Update runner documents.

* update

* fix link

* update

* update

* Update import manner of Runner

Co-authored-by: Wenwei Zhang <40779233+ZwwWayne@users.noreply.github.com>