removing some dead code

src/main.rs

@@ -28,14 +28,6 @@ fn startup(
         alpha_mode: AlphaMode::Blend,
     });
 
-    // Standard material with opaque grid texture (stretched)
-    // let material = materials.add(StandardMaterial {
-    //     base_color_texture: Some(grid_texture.clone()),
-    //     alpha_mode: AlphaMode::Opaque,
-    //     unlit: true,
-    //     ..default()
-    // });
-
     let solid_material = solid_materials.add(materials::SolidMaterial{});
 
     // a ground plane