* [Refactor] Use mdformat instead of markdownlint to format markdown.
* Update unavailiable api links in tutorials
* Update CONTRIBUTING.md
* Use mdformat==0.7.9 to support Python 3.6
* Add model-pages
* Add shortname in configs
* Use link directly instead of `switch_language.md`
* Auto collapse model-zoo pages.
* Fix link in RegVGG
* Add link replace
* fix lint