update the router guide

docs/router/src/SUMMARY.md

@@ -2,30 +2,8 @@
 
 [Introduction](./index.md)
 
-# Features
-- [Adding the Router to Your Application](./features/index.md)
-- [Defining Routes](./features/routes/index.md)
-  - [Nested Routes](./features/routes/nested.md)
-  - [Catch All Routes](./features/routes/catch_all.md)
-  - [Matching Routes](./features/routes/matching.md)
-  - [Fallback Routes (404 page)](./features/routes/fallback.md)
-  - [Multiple Components & Redirects](./features/routes/multiple-and-redirect.md)
-- [Outlets](./features/outlets.md)
-- [Links & Navigation](./features/navigation/index.md)
-  - [Named Navigation](./features/navigation/name.md)
-  - [External Navigation](./features/navigation/external.md)
-  - [Programmatic Navigation](./features/navigation/programmatic.md)
-- [Query](./features/query.md)
-- [Navigation Failures](./features/failures/index.md)
-  - [Named Navigation Failure](./features/failures/named.md)
-  - [External Navigation Failure](./features/failures/external.md)
-  - [Redirection Limit Failure](./features/failures/redirection-limit.md)
-- [History Providers](./features/history-providers.md)
-- [History Buttons](./features/history-buttons.md)
-- [Sitemap Generation](./features/sitemap-generation.md)
-- [Routing Update Callback](./features/routing-update-callback.md)
-
 # Example Project
+
 - [Overview](./example/index.md)
 - [Creating Our First Route](./example/first-route.md)
 - [Building a Nest](./example/building-a-nest.md)