Add hosting instructions for Shuttle (#334)

* Add hosting instructions for Shuttle

* move shuttle sample code to examples dir

---------

Co-authored-by: Rob Ede <robjtede@icloud.com>

docs/shuttle.md

@@ -0,0 +1,43 @@
+---
+title: Hosting on Shuttle
+---
+
+import CodeBlock from '@site/src/components/code_block.js';
+
+# Hosting on Shuttle
+
+<img width="300" src="https://raw.githubusercontent.com/shuttle-hq/shuttle/master/assets/logo-rectangle-transparent.png"/>
+
+> [**Shuttle**](https://www.shuttle.rs) is a Rust-native cloud development platform that lets you deploy your Rust apps for free.
+
+Shuttle has out-of-the-box support for Actix Web. Follow these steps to host your web service on Shuttle:
+
+1. Add Shuttle dependencies to `Cargo.toml`:
+
+<CodeBlock example="shuttle" file="manifest" section="shuttle-deps" language="toml" />
+
+2. Add the `#[shuttle_runtime::main]` annotation and update the `main` function as follows:
+
+<CodeBlock example="shuttle" section="shuttle-hello-world" />
+
+3. Install `cargo-shuttle`:
+
+```sh
+cargo install cargo-shuttle
+```
+
+4. Create your project on the Shuttle platform:
+
+```sh
+cargo shuttle project start
+```
+
+5. Deploy! 🚀
+
+```sh
+cargo shuttle deploy
+```
+
+You can run `cargo shuttle run` to test your application locally.
+
+Check out some complete Actix Web examples [here](https://github.com/shuttle-hq/shuttle-examples/tree/main/actix-web).