add rewritten router book and fix features code

docs/router/src/index.md

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+# Introduction
+Whether or not you are building a website, desktop app, or mobile app,
+splitting your app's views into "pages" can be an effective method for
+organization and maintainability.
+
+For this purpose, Dioxus provides a router. To start utilizing it, add it as a
+dependency in your `Cargo.toml` file:
+```toml
+[dependencies]
+# use this for native apps
+dioxus-router = "*"
+#use this for web apps
+dioxus-router = { version = "*", features = ["web"] }
+
+# in both cases replace * with the current version
+```
+
+You can also use the `cargo` command to add the dependency:
+```sh
+$ cargo add dioxus-router
+$ cargo add dioxus-router --features web
+```
+
+> If you are not familiar with Dioxus itself, check out the [Dioxus book][db]
+> first.
+
+This book is intended to get you up to speed with Dioxus Router. It is split
+into two sections:
+1. The [Features](./features/index.md) part explains individual features in
+   depth. You can read it start to finish, or you can read individual chapters
+   in whatever order you want.
+2. If you prefer a learning-by-doing approach, you can check ouf the
+   _[example project](./example/introduction.md)_. It guides you through
+   creating a dioxus app, setting up the router and using some of its
+   functionality.
+
+> Please note that this is not the only documentation for the Dioxus Router. You
+> can also check out the [API Docs][api].
+
+[api]: https://docs.rs/dioxus-router/
+[db]: https://dioxuslabs.com/guide/