I had used the new Clarity theme on the Documentation site, but although it looked great and was super-readable, I've reverted this back to Modern for now, as Clarity as yet doesn't support a menu that's three levels deep.
I'll have a think about this, and either add extra menu levels to Clarity or rejig the documentation so that it doesn't need it. The documentation is in need of an overhaul anyway so maybe this is the push I need to get on with it!
In the meantime Clarity is shown on the Demo Site. And if anyone uses it on their site and likes it then please mention it in this thread so others can have a look!
Thanks
Joe