Update plans based on feedback and reflection

After feedback and having a think about the point of this class, I'm going to update it to change the following things:

1. Obviously to make it look better, it's pretty basic right now.
2. The focus was meant to be on you being a delver into forbidden secrets you were never meant to find, which I don't think came through well. I'm going to mess with the class blurb a bit and add a background table, something along the lines of "what did you find which means you can't trust them?" The idea here is to give it a bit more immediate "pick up and play" focus - you should be able to pick the class and immediately think "right this is the sort of thing I do".

I'll add another dev log when I've made the changes. If anyone is reading this I'd love to hear any suggestions.