* feat(v2): allow non sidebar category to be first item of sidebar
* better error messages
* edit the react component
* Update website/docs/sidebar.md
* nits
* add @babel/plugin-transform-runtime
* wip: versioning
* wip again
* nits lint
* refactor metadata code so that we can have inobject properties optimization, fix typing
* remove buggy permalink code
* modify versioned docs fixture such that foo/baz only exists in v1.0.0
* refactor metadata.ts so that there is less transformon object
* more refactoring
* reduce test fixtures, refactoring
* refactoring readability
* finish metadata part
* refactor with readdir
* first pass of implementation
* fix mdx laoder
* split generated routes by version for performance & smaller bundle
* test data for demo
* refactor with set
* more tests
* typo
* fix typo
* better temporary ui
* stronger typing & docsVersion command
* add 100% test coverage for docsVersion command
* more test and delete manual docs cut
* cut 2.0.0-alpha.35 docs
* cut alpha.36 instead
* copyright
* delete versioned docs
* stronger test on metadata
* update typo
* update jest config
* add more tests on docs plugin
* fix(v2): docs plugin should not add routes if there are no docs
* fix
* rm -rf coverage
* nits
* update