Add memochain example

examples/signals.rs

@@ -39,7 +39,7 @@ fn app() -> Element {
         button { onclick: move |_| count -= 1, "Down low!" }
         button { onclick: move |_| running.toggle(), "Toggle counter" }
         button { onclick: move |_| saved_values.push(count().to_string()), "Save this value" }
-        button { onclick: move |_| saved_values.write().clear(), "Clear saved values" }
+        button { onclick: move |_| saved_values.clear(), "Clear saved values" }
 
         // We can do boolean operations on the current signal value
         if count() > 5 {
@@ -47,7 +47,7 @@ fn app() -> Element {
         }
 
         // We can cleanly map signals with iterators
-        for value in saved_values.read().iter() {
+        for value in saved_values.iter() {
             h3 { "Saved value: {value}" }
         }