[Doc Request]: Publish the document as a pdf

[lacrimosaprinz]

Is there an existing issue about this doc request?

• I have checked the existing issues.

Describe the doc request.

Need a tool to publish the documents as a pdf：

1. yinxiaofei designs the template style of pdf;
2. xuoutput/3fuyang develops tools according to pdf templates and publishes documents as pdf.
   • can build the documents as pdf in the backend
   • can download the documents as pdf on the website

Reference:
① https://download.pingcap.org/tidb-stable-en-manual.pdf
②

[lacrimosaprinz]

1. word can be generated
2. PDFs can be built with local instructions