add rewritten router book and fix features code

docs/router/src/example/index.md

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+# Overview
+
+In this guide you'll learn to effectively use Dioxus Router whether you're
+building a small todo app or the next FAANG company. We will create a small
+website with a blog, homepage, and more!
+
+> To follow along with the router example, you'll need a working Dioxus app.
+> Check out the [Dioxus book][db] to get started.
+
+> Make sure to add Dioxus Router as a dependency, as explained in the
+> [introduction](../index.md).
+
+## You'll learn how to
+- Create routes and render "pages".
+- Utilize nested routes, create a navigation bar, and render content for a
+  set of routes.
+- Gather URL parameters to dynamically display content.
+- Redirect your visitors wherever you want.
+
+> **Disclaimer**
+>
+> The example will only display the features of Dioxus Router. It will not
+> include any actual functionality. To keep things simple we will only be using
+> a single file, this is not the recommended way of doing things with a real
+> application.
+
+You can find the complete application in the [full code](./full-code.md)
+chapter.
+
+[db]: https://dioxuslabs.com/guide/