Add a version selector dropdown to the documentation site in order to switch between different documentation versions of the releases.
Docs site is located here: https://docs.orchardcore.net/en/latest/releases/2.2.1/
It is using MkDocs and a Material theme (https://github.com/squidfunk/mkdocs-material, https://squidfunk.github.io/mkdocs-material/)
The contents used for documentation are in .md files located in src/docs folder.

Releases started with version 1.0.
Current release is 2.2.1 (Changelog is here: https://docs.orchardcore.net/en/latest/releases/2.2.1/) so the current version of docs should display "2.2" (major.minor)
Next version will be 3.0 (latest from main).

One solution could be to use this feature: https://squidfunk.github.io/mkdocs-material/setup/setting-up-versioning/

Explain how adding the version would impact the urls of the documentation pages.
Document the procedure and the required steps to execute when a new release is created and we expect to obtain a new version in the documentation site.
Take screenshots of the result to check that the version selector is correctly displayed in the header of the documentation site.