feat: add mkdocs-material

[bh1xaq]

add new app mkdocs-material.
Happy Qixi 2023.

[f2c-ci-robot]

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[wanghe-fit2cloud]

感谢您提交 PR 并关注我们的项目。经过仔细审阅，有以下几点需要进行修改和更新：

1. README 文件可以参考 Halo 的。
2. 镜像版本建议不要使用 latest（不方便问题定位和后期应用升级），刚查看 Docker Hub，最新版本应该是 9.4.6。
3. 我们对应用标签进行了更详细的分类，也请您同步进行相应的修改。