Faster jams page

The jams page isn’t built with virtual content anymore. Now, whenever someone visits the page, it checks the Last.fm API for new data and then creates a standard page using that info.

This really speeds up the Kirby backend, which was super slow to load before. The front-end page is faster too, since it’s now using standard page generation.

We’ve also added a safeguard so the content doesn’t sync every single time the page is accessed.