refactor: remove the rsx folder

it doesn't seem to be published anywhere or used at all

packages/rsx/Cargo.toml

@@ -1,12 +0,0 @@
-[package]
-name = "dioxus-rsx"
-version = "0.1.0"
-edition = "2018"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]
-proc-macro-error = "1"
-proc-macro2 = { version = "1.0.6" }
-quote = "1.0"
-syn = { version = "1.0.11", features = ["full", "extra-traits"] }