Remove broken links in examples/README.md (#4318)

* fix(examples): remove broken links from `examples/README.md`

* Document the new examples

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

examples/README.md

@@ -44,24 +44,22 @@ cargo run --example hello_world
 
 [form](./form.rs) - Handle form submission
 
-[inputs](./inputs.rs) - Input values
-
 [nested_listeners](./nested_listeners.rs) - Nested handlers and bubbling
 
-[textarea](textarea.rs) - Text area input
-
 ### State Management
 
 [context_api](./context_api.rs) - Cross-component state sharing via Context API
 
+[counters](./counters.rs) - Mapping a `Signal<Vec<T>>` into UI elements
+
+[futures](./future.rs) - Handle async Rust with use_future, use_effect, and async event handlers
+
 ### Async
 
 [login_form](./login_form.rs) - Login endpoint example
 
 [suspense](./suspense.rs) - Render placeholders while data is loading
 
-[tasks](./tasks.rs) - Continuously run future
-
 ### SVG
 
 [svg](./svg.rs)
@@ -92,6 +90,8 @@ cargo run --example hello_world
 
 [window_zoom](./window_zoom.rs) – Zoom in or out
 
+[popup](./popup.rs) - Create a popup window and send data back to the main window
+
 ## Example Apps
 
 [calculator](./calculator.rs) - Simple calculator