More customization for the themes.

I think adding 3 different categories of Sudowrite themes would be really cool, I really like the Aurora Borealis theme but the colors of pages to the background theme are really similar so it’s hard to see them when in home page, maybe adding a “page” color category, and a “outline” color category, and leave the ones that we have as is, just make them under a “background” category and make them only affect said background.