Clean up a removed example from examples/README.md

code removed in https://github.com/DioxusLabs/dioxus/commit/c4a18bc24d8722dda6c7c432a18f11671046718a

examples/README.md

@@ -18,8 +18,6 @@ cargo run --example hello_world
 
 [custom_assets](./custom_assets.rs) - Include images
 
-[custom_element](./custom_element.rs) - Render webcomponents
-
 [custom_html](./custom_html.rs) - Customize wrapper HTML
 
 [eval](./eval.rs) - Evaluate JS expressions
@@ -175,4 +173,4 @@ Missing examples
 - Custom elements
 - Component Children: Pass children into child components
 - Render To string: Render a mounted virtualdom to a string
-- Testing and Debugging
+- Testing and Debugging