Rename and update image paths for consistent documentation structure and improved organization.

Author: gpx1000

en/Building_a_Simple_Engine/Lighting_Materials/02_lighting_models.adoc

@@ -113,7 +113,7 @@ Considerations for using PBR:
 
 For comprehensive information on PBR, see the link:https://www.pbr-book.org/[Physically Based Rendering book].
 
-image::../attachments/simple_engine/Assets/PBR_ray_shadows.png[PBR materials with ray-traced shadows - demonstrating metallic surfaces, roughness variation, and realistic shadow rendering]
+image::images/PBR_ray_shadows.png[PBR materials with ray-traced shadows - demonstrating metallic surfaces, roughness variation, and realistic shadow rendering]
 
 == Lighting Models in glTF
 

en/Building_a_Simple_Engine/Loading_Models/04_loading_gltf.adoc

@@ -165,7 +165,7 @@ These properties can be specified as constant values or as texture maps for
 spatial variation across the surface. We'll go into details about PBR in the
 next few chapters.
 
-image::../attachments/simple_engine/Assets/bookstand.png[Bookstand with complex PBR materials - demonstrating wood, glass, metal, and paper textures with varied material properties]
+image::images/bookstand.png[Bookstand with complex PBR materials - demonstrating wood, glass, metal, and paper textures with varied material properties]
 
 ==== Texture Formats and Compression
 

en/Building_a_Simple_Engine/introduction.adoc

@@ -54,7 +54,7 @@ xref:conclusion.adoc[Previous: Main Tutorial Conclusion] | xref:Building_a_Simpl
 
 To follow along with the attachments-based Simple Engine examples and scenes, fetch the Bistro assets locally.
 
-image::../attachments/simple_engine/Assets/MainEntry.png[The Bistro scene - a detailed outdoor café environment demonstrating the engine's rendering capabilities]
+image::images/MainEntry.png[The Bistro scene - a detailed outdoor café environment demonstrating the engine's rendering capabilities]
 
 - Linux/macOS (default target: attachments/simple_engine/Assets/bistro at repository root):
 +