fix: use placehold.co instead of via.placeholder.com

The via.placeholder.com service is unreliable. Switch to placehold.co for demo images.

Author: AMDphreak

docs/modules/ROOT/pages/images.adoc

@@ -14,24 +14,24 @@ Here's another badge: image:https://img.shields.io/badge/license-MIT-blue.svg[Li
 
 === Basic Image
 
-image::https://via.placeholder.com/600x300/25262b/c1c2c5?text=Sample+Image[Sample Image,600,300]
+image::https://placehold.co/600x300/25262b/c1c2c5?text=Sample+Image[Sample Image,600,300]
 
 === Image with Caption
 
 .A placeholder image demonstrating dark theme colors
-image::https://via.placeholder.com/600x200/1a1b1e/4dabf7?text=Dark+Theme+Colors[Dark Theme Colors,600,200]
+image::https://placehold.co/600x200/1a1b1e/4dabf7?text=Dark+Theme+Colors[Dark Theme Colors,600,200]
 
 === Image with Title and Alt Text
 
 [#fig-placeholder]
 .Figure 1: Theme Color Palette
-image::https://via.placeholder.com/500x150/141517/f1f3f5?text=Navbar+Color[Navbar Background Color,500,150]
+image::https://placehold.co/500x150/141517/f1f3f5?text=Navbar+Color[Navbar Background Color,500,150]
 
 == Image Alignment
 
 === Left Aligned Image
 
-image::https://via.placeholder.com/200x100/373a40/c1c2c5?text=Left[Left aligned,200,100,role=left]
+image::https://placehold.co/200x100/373a40/c1c2c5?text=Left[Left aligned,200,100,role=left]
 
 This text flows around the left-aligned image.
 The dark theme ensures images integrate well with the surrounding content regardless of alignment.
@@ -42,7 +42,7 @@ Notice how the text wraps naturally around the image.
 
 === Right Aligned Image
 
-image::https://via.placeholder.com/200x100/373a40/c1c2c5?text=Right[Right aligned,200,100,role=right]
+image::https://placehold.co/200x100/373a40/c1c2c5?text=Right[Right aligned,200,100,role=right]
 
 This text flows around the right-aligned image.
 Right alignment is useful for supplementary visuals that support the main content.
@@ -53,29 +53,29 @@ The clear float ensures content flows properly.
 
 === Center Aligned Image
 
-image::https://via.placeholder.com/300x100/2c2e33/f1f3f5?text=Centered[Centered image,300,100,role=text-center]
+image::https://placehold.co/300x100/2c2e33/f1f3f5?text=Centered[Centered image,300,100,role=text-center]
 
 == Image Sizes
 
 === Small Image
 
-image::https://via.placeholder.com/150x100/25262b/c1c2c5?text=Small[Small,150,100]
+image::https://placehold.co/150x100/25262b/c1c2c5?text=Small[Small,150,100]
 
 === Medium Image
 
-image::https://via.placeholder.com/300x150/25262b/c1c2c5?text=Medium[Medium,300,150]
+image::https://placehold.co/300x150/25262b/c1c2c5?text=Medium[Medium,300,150]
 
 === Large Image
 
-image::https://via.placeholder.com/600x200/25262b/c1c2c5?text=Large[Large,600,200]
+image::https://placehold.co/600x200/25262b/c1c2c5?text=Large[Large,600,200]
 
 == Image Gallery
 
 [.image-gallery]
 --
-image:https://via.placeholder.com/150x150/4dabf7/ffffff?text=1[Image 1,150,150]
-image:https://via.placeholder.com/150x150/74c0fc/ffffff?text=2[Image 2,150,150]
-image:https://via.placeholder.com/150x150/a5d8ff/1a1b1e?text=3[Image 3,150,150]
+image:https://placehold.co/150x150/4dabf7/ffffff?text=1[Image 1,150,150]
+image:https://placehold.co/150x150/74c0fc/ffffff?text=2[Image 2,150,150]
+image:https://placehold.co/150x150/a5d8ff/1a1b1e?text=3[Image 3,150,150]
 --
 
 == Icons
@@ -115,10 +115,10 @@ Refer to <<fig-placeholder>> for an example of the theme color palette.
 |===
 | Preview | Description
 
-| image:https://via.placeholder.com/100x60/25262b/c1c2c5?text=Thumb[Thumbnail,100,60]
+| image:https://placehold.co/100x60/25262b/c1c2c5?text=Thumb[Thumbnail,100,60]
 | This is a thumbnail image inside a table cell.
 
-| image:https://via.placeholder.com/100x60/141517/f1f3f5?text=Dark[Dark theme,100,60]
+| image:https://placehold.co/100x60/141517/f1f3f5?text=Dark[Dark theme,100,60]
 | Another image demonstrating dark colors in a table.
 |===
 
@@ -128,7 +128,7 @@ Refer to <<fig-placeholder>> for an example of the theme color palette.
 ====
 Here's a visual tip:
 
-image::https://via.placeholder.com/400x100/25262b/4dabf7?text=Tip+Image[Tip with image,400,100]
+image::https://placehold.co/400x100/25262b/4dabf7?text=Tip+Image[Tip with image,400,100]
 
 Images work well inside admonition blocks.
 ====