Add immersive content blocks

The three items approaching the bottom of the block palette—sidecar, slideshow, and map tour—all provide unique multimedia formats. The latter three are considered "immersive" blocks, due to the fact that they occupy the entire browser window as you scroll through them.

You can use any or all of these exciting blocks in your narratives, or none at all. But they're a nice way to add variety to your story, and can be useful for specific purposes such as making a presentation or guiding readers through a series of points of interest.