* 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

* [Enhance] Add RuntimeInfoHook to update runtime information.

* move lr to runtime info

* docstring

* resolve comments

* update ut and doc

* [Fix] Fix some bugs in hooks and runner.

* fix markdown

* fix latex formula

* resolve comments

* Replace markdownlint with mdformat to avoid installing ruby

* fix circleci

* Modify hook documentation

* reslove comments

* [Docs] Add hooks tutorial

* improve the description about hooks

* Add OptimizerHook usages

* fix comments

* fix comments

* fix comments

* fix comments

* fix typo

* refine description

* refactor

* refactor

* add a sentence to improve docs

* briefly introduce the hook of pytorch

* refactor the order of sections

* improve the description about hooks

* improve

* fix comments

* update priorities

* improve description

* refactor title

* fix typo

* reorder priority of hook

* fix typo

* fix comments

* remove the distributed argument from SyncBuffersHook