Rename headless_defaults example to no_renderer for clarity (#5263)

# Objective

- Reduce confusion as the example opens a window and isn't truly "headless"
- Fixes https://github.com/bevyengine/bevy/issues/5260.


## Solution

- Rename the example and add to the docs that the window is expected.

Cargo.toml

@@ -594,12 +594,12 @@ category = "Application"
 wasm = false
 
 [[example]]
-name = "headless_defaults"
-path = "examples/app/headless_defaults.rs"
+name = "no_renderer"
+path = "examples/app/no_renderer.rs"
 
-[package.metadata.example.headless_defaults]
-name = "Headless with Defaults"
-description = "An application that runs with default plugins, but without an actual renderer"
+[package.metadata.example.no_renderer]
+name = "No Renderer"
+description = "An application that runs with default plugins and displays an empty window, but without an actual renderer"
 category = "Application"
 wasm = false
 

examples/README.md

@@ -143,8 +143,8 @@ Example | Description
 [Empty](../examples/app/empty.rs) | An empty application (does nothing)
 [Empty with Defaults](../examples/app/empty_defaults.rs) | An empty application with default plugins
 [Headless](../examples/app/headless.rs) | An application that runs without default plugins
-[Headless with Defaults](../examples/app/headless_defaults.rs) | An application that runs with default plugins, but without an actual renderer
 [Logs](../examples/app/logs.rs) | Illustrate how to use generate log output
+[No Renderer](../examples/app/no_renderer.rs) | An application that runs with default plugins and displays an empty window, but without an actual renderer
 [Plugin](../examples/app/plugin.rs) | Demonstrates the creation and registration of a custom plugin
 [Plugin Group](../examples/app/plugin_group.rs) | Demonstrates the creation and registration of a custom plugin group
 [Return after Run](../examples/app/return_after_run.rs) | Show how to return to main after the Bevy app has exited

examples/app/no_renderer.rs

@@ -1,5 +1,8 @@
-//! An application that runs with default plugins, but without an actual renderer.
+//! An application that runs with default plugins and displays an empty
+//! window, but without an actual renderer.
 //! This can be very useful for integration tests or CI.
+//!
+//! See also the `headless` example which does not display a window.
 
 use bevy::{prelude::*, render::settings::WgpuSettings};