WorldEnvironment tutorial needs better explanation for 2D

Many 2D projects want or need to use the WorldEnvironment node, but the [tutorial ](https://docs.godotengine.org/en/3.1/tutorials/3d/environment_and_post_processing.html)is focused on the perspective of a 3D project.

The WE node is already confusing enough as it is. Despite having read through the tutorial many times, it took me months of continuously asking on Discord and Reddit and sleepless nights of painful trail and error to figure out what I need to do to make my graphics glow at all, and then even longer to figure out how to do it deliberately and intentionally.

Maybe a real solution would be to make a separate WorldEnvironment2D node with just the features relevant to 2D, but as it is right now, it would be of great help if the tutorial would explain how to use the WE node in 2D projects.
This way if someone needs to use it for 2D, they can just be sent to the tutorial, and the community won't have to keep repeating the same [page-long replies](https://www.reddit.com/r/godot/comments/degfn9/asteroids_coming_home_gameplay_preview/f2v8ndf?utm_source=share&utm_medium=web2x) over and over again in the community channels.