doc: add build.md to doc about how to build doc locally

.github/build.md

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+# 快速编译指南
+
+## RST语言指南
+
+- [Sphinx reStructuredText Primer](https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html)
+- [RST语法](https://3vshej.cn/rstSyntax/)
+
+## 文档编译编译开发
+
+请在你自己的目录下clone代码，修改完文档查看效果请执行如下命令来进行文档的编译。
+
+> 如果你是docker环境，请把 `podman` 换成 `docker` 即可
+
+> 如果你在芯来内网，请把 `docker.io/nucleisoftware` 替换成 `rego.corp.nucleisys.com/software`
+
+~~~shell
+# 当前已处于文档所在根目录下
+podman run -it -v $(pwd):/nuclei/workspace docker.io/nucleisoftware/docbuilder:latest
+# 进入到docker 环境下
+# 清理之前的编译
+make clean
+# 编译网页文档
+make all
+# 编译pdf文档
+make pdf
+~~~
+
+**如果需要预览文档效果，请新开一个shell环境，并运行如下命令**
+
+~~~shell
+# 环境设置 以下命令需要在芯来内部环境
+source /home/share/devtools/env.sh
+# 这个依赖的工具 httpserver_cli 位于 Nuclei SDK tools/scripts/nsdk_cli 中
+# 预览网页，在本地浏览器中打开预览的网址
+make preview
+~~~
+
+
+## 发送Pull Request
+
+文档开发请创建自己的开发分支例如, `feature/update_idedoc`, 如果开发完毕，就往master分支发送pull request，请求review，review完毕，CI PASS以后
+就可以合入了。
+
+**参见如下文章**
+
+- https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request
+- https://github.com/Nuclei-Software/nuclei-tool-guide/pull/7
+
+# Prepare
+
+The podman image we use is `docker.io/nucleisoftware/docbuilder:latest`.
+
+Here are the steps to get this image:
+
+~~~shell
+# Pull image
+podman pull docker.io/nucleisoftware/docbuilder/docbuilder:latest
+~~~
+
+# Build Document
+
+Here are the steps to build the documentation:
+
+~~~shell
+# in host pc, run this podman image
+podman run -it -v $(pwd):/nuclei/workspace docker.io/nucleisoftware/docbuilder:latest
+# in docker image now
+# build html doc, html doc will be saved in build/html
+make html
+# build pdf doc, pdf doc will be saed in build/latex and copy to build/html/
+make pdf
+~~~