Really like Grav, I’d like to start using it for some sort of knowledge base/support articles, just like you did with learn.getgrav.org. I want to offer the user a downloadable manual in PDF with all the support articles combined. Therefore I want to create a theme that outputs all the support articles with an index. For the site a theme similar to learn.getgrav.org will be used. As soon as the user presses the Grav should switch theme on the fly so that the HTML of the PDF theme can be used for the PDF. Would something like this be possible?