Remove mkdocs

docs/README.md

-# Build documentation with MkDocs
-
-OceanBase documentation is built with [MkDocs](https://www.mkdocs.org/). You can check [`mkdocs.yml`](mkdocs.yml) for more information.
-Please install MkDocs according to [the installation documents of MkDocs](https://www.mkdocs.org/user-guide/installation/)
-
-## Requirements
-
-Before installing dependencies, please make sure you have installed a recent version of Python 3 and pip.
-
-Then you can run the following command in your terminal at current directory:
-
-```
-$ pip install -r requirements.txt
-```
-## Build the documentation
-
-You can build the documentation by running the following command:
-
-```
-$ mkdocs build
-```
-
-This will create a new directory to store the output files, which is `site/` by default.
-
-## Start a server locally
-
-You can start a server locally by running the following command:
-
-```
-$ mkdocs serve
-```
-Open up http://127.0.0.1:8000/ in your browser, and you'll see the default home page.
-
-## Modify pages
-
-### Edit a page
-
-If you want to modify the content of a page, you can edit the markdown file in `docs/` directory directly.
-
-### Modify the layout of pages
-
-To modify the layout of pages, you need to edit `mkdocs.yml`.
-
-For configuration details, see [MkDocs User Guide](https://www.mkdocs.org/user-guide/configuration/).
-
-Note the following rules when editing documents:
-- All paths in `nav` must be relative to the `docs_dir`, which is `docs` by default. So here `./` is equivalent to [docs](docs).
-- All internal links must be relative paths, as MkDocs only supports regular Markdown linking syntax.
-
-## Contribute
-
-See [How to contribute](wiki/how_to_contribute)

docs/requirements.txt

-mkdocs==1.1.2
-mkdocs-oceanbase
-mkdocs-macros-plugin
-mike
-mdx_truly_sane_lists
-mkdocs_latest_release_plugin
-mkdocs-git-revision-date-localized-plugin
-weasyprint
-mkdocs-with-pdf
-qrcode
-mkdocs-material