Update bevy website link in newer code (#19874)

# Objective

I was lurking and noticed that some links to the Bevy website were not
updated in newer code (`bevyengine.org` -> `bevy.org`).

## Solution

- Look for `bevyengine.org` occurrences in the current code, replace
them with `bevy.org`.

## Testing

- Did you test these changes? If so, how? I visited the Bevy website!
- Are there any parts that need more testing?
- How can other people (reviewers) test your changes? Is there anything
specific they need to know?
- If relevant, what platforms did you test these changes on, and are
there any important ones you can't test?

## Longer term

- Maybe add a lint to flag references to the old website but I don't
know how to do that. But not sure it's needed as the more time will pass
the less it will be relevant.

crates/bevy_core_widgets/Cargo.toml

@@ -3,7 +3,7 @@ name = "bevy_core_widgets"
 version = "0.17.0-dev"
 edition = "2024"
 description = "Unstyled common widgets for Bevy Engine"
-homepage = "https://bevyengine.org"
+homepage = "https://bevy.org"
 repository = "https://github.com/bevyengine/bevy"
 license = "MIT OR Apache-2.0"
 keywords = ["bevy"]

crates/bevy_feathers/Cargo.toml

@@ -3,7 +3,7 @@ name = "bevy_feathers"
 version = "0.17.0-dev"
 edition = "2024"
 description = "A collection of UI widgets for building editors and utilities in Bevy"
-homepage = "https://bevyengine.org"
+homepage = "https://bevy.org"
 repository = "https://github.com/bevyengine/bevy"
 license = "MIT OR Apache-2.0"
 keywords = ["bevy"]

crates/bevy_solari/Cargo.toml

@@ -3,7 +3,7 @@ name = "bevy_solari"
 version = "0.17.0-dev"
 edition = "2024"
 description = "Provides raytraced lighting for Bevy Engine"
-homepage = "https://bevyengine.org"
+homepage = "https://bevy.org"
 repository = "https://github.com/bevyengine/bevy"
 license = "MIT OR Apache-2.0"
 keywords = ["bevy"]

examples/3d/fog.rs

@@ -4,7 +4,7 @@
 //!
 //! The [`FogFalloff`] field controls most of the behavior of the fog through different descriptions of fog "curves". I.e. [`FogFalloff::Linear`] lets us define a start and end distance where up until the start distance none of the fog color is mixed in and by the end distance the fog color is as mixed in as it can be. [`FogFalloff::Exponential`] on the other hand uses an exponential curve to drive how "visible" things are with a density value.
 //!
-//! [Atmospheric fog](https://bevyengine.org/examples/3d-rendering/atmospheric-fog/) is another fog type that uses this same method of setup, but isn't covered here as it is a kind of fog that is most often used to imply distance and size in clear weather, while the ones shown off here are much more "dense".
+//! [Atmospheric fog](https://bevy.org/examples/3d-rendering/atmospheric-fog/) is another fog type that uses this same method of setup, but isn't covered here as it is a kind of fog that is most often used to imply distance and size in clear weather, while the ones shown off here are much more "dense".
 //!
 //! The bulk of this example is spent building a scene that suites showing off that the fog is working as intended by creating a pyramid (a 3D structure with clear delineations), a light source, input handling to modify fog settings, and UI to show what the current fog settings are.
 //!