ADWSteamGTK makes steam look more inline with GTK

cross-posted from: https://feddit.uk/post/4830921

I was watching InfinitelyGalactic recent video on Linux mint and he highlighted this program. Works really well I've always found steam to be a bit unruly within my desktop especially as I run the forge gnome extension, which further exacerbates the weird behaviours. Supports most of the big colour schemes so finding something that will work for you is pretty easy.