The documentation should mention mapping configurations

[DerEchtePilz]

Documentation URL

https://docs.commandapi.dev/dev-setup/shading

What the documentation currently says

The documentation basically only has instructions on how to shade the CommandAPI properly into a plugin.
Since Paper 1.20.5+, the server is now mojang mapped and issues on GitHub and in the Discord have been brought up because of that, most recently in CommandAPI/CommandAPI#603

Proposed fix

The documentation should include a small section outlining different mapping configurations and should also link to the Paper docs regarding the required entry in the MANIFEST.MF when using the mojang mapped version with a plugin.yml.

[MC-XiaoHei]

I made a tentative commit in a branch of the documentation that I hope you can review

83e1705