Clarify what files need to be included

[cadop]

This PR clarifies for absolute beginners that the installation of a single file is only possible when using the base theme, and the sidebar only theme requires both files.

[cadop]

uh, that was a weird comment. But in any case, @jothepro , do you want to merge this? I can delete the PR if you don't want to add the language.

[jothepro]

Also the account commented in multiple issues and discussions in this repo, always the same message, until I blocked the account. Weird.

I haven't forgotten about your PR, I'm just too involved in other things right now to apply your improvements. I plan to restructure the installation instructions a bit based on your feedback, so this will likely not be merged but definitely be an inspiration to fix the flaw in the documentation that you addressed. 😊

[cadop]

ha! okay