I'll try to see if I can find what pages contain that sort of content, but I don't think I've ever published anything here that wasn't my own custom content. Do you have any specific pages you could link? If not, I'll try and look through the whole wiki, but nothing really comes to mind.
The System Reference Document (SRD) includes all 12 of the base classes, with the only class released outside of that being the Artificer. The Artificer isn't on this wiki, and even if the other classes were to be rehosted--which none of them are, to my knowledge--then that would still be following Wizard of the Coasts' guidelines.
The absolute closest thing that seems like it would make some sense is how the classes are formatted? But those are also part of the SRD, and therefore Wizards of the Coast allows them.