A documentation can be separated into different versions.
Several steps are necessary for this.
Usage
A separate subfolder is necessary for each version.
docs
book
v3
introduction.md
installation.md
…
v2
introduction.md
installation.md
…
index.md
Extend the nav section of the MkDocs configuration file and a new section must be created for each version.
Add the related navigation entries in these sections.