Ported over the original code from the VPN project and updated and tweaked it quite a lot to get better layout options. There's still the main layout to do, and I'll use CSS grid for that. In the process of today's work, I found errors in lots of poem encodings, which I fixed; added Schematron rules to prevent some of them; added missing bits to the taxonomies; and various other updates and fixes. This is all good progress.