wip: remove runner on hook and then update docs

docs/guide/src/async/index.md

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+# Working with Async
+
+Not all apps you'll build can be self-contained with synchronous code. You'll often need to interact with file systems, network interfaces, hardware, or timers. 
+
+So far, we've only talked about building apps with synchronous code, so this chapter will focus integrating asynchronous code into your app.
+
+
+## The Runtime
+
+By default, Dioxus-Desktop ships with the `Tokio` runtime and automatically sets everything up for you. 
+
+
+
+## Send/Sync
+Writing apps that deal with Send/Sync can be frustrating at times. Under the hood, Dioxus is not currently thread-safe, so any async code you write does *not* need to be `Send/Sync`. That means Cell/Rc/RefCell are all fair game.
+
+
+
+All async code in your app is polled on a `LocalSet`, so any async code we w