Fix Accessibility Contrast Issue for Learn more Buttons

[huangkevin-apr]

Issue Description

This PR fixes an accessibility violation reported by automated a11y checks.
When running IBM Accessibility Checker (Version 4.0.9) on the showcase page, I find some accessibility violations as below.

The "Learn more" buttons in the showcase section have insufficient color contrast, failing to meet WCAG AA accessibility requirements. As shown in the accessibility checker:

Current contrast ratio: 3.06:1
Required contrast ratio: 4.5:1 (WCAG AA standard for text size 15px and weight 500)

This affects users with low vision or color blindness who rely on adequate contrast to read text content.

Fix Description

Updated the button text color from --ifm-color-emphasis-600 to --ifm-color-emphasis-800 in website/src/css/showcase.scss.
This change increases the contrast ratio to meet WCAG AA requirements while maintaining the design's visual hierarchy.

Generated Patch of A11YRepair:

diff --git a/website/src/css/showcase.scss b/website/src/css/showcase.scss
index 49f15912..2999191a 100644
--- a/website/src/css/showcase.scss
+++ b/website/src/css/showcase.scss
@@ -174,7 +174,7 @@ html[data-theme="dark"] {
   }
 
   .articleButton {
-    color: var(--ifm-color-emphasis-600);
+    color: var(--ifm-color-emphasis-800);
     font-weight: 500;
     font-size: 15px;
     padding: 6px 12px;

Note: The patch submitted in this PR was generated by A11YRepair, an automated Web Accessibility repair tool that I developed to address common accessibility violations in web applications. The generated fixes were manually reviewed and validated before submission, which ensures proper contrast in both light mode and dark mode, providing consistent accessibility across all theme variations.

Fix Before:

Fix After:

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[Simek]

Thanks for catching that, and proposing the correction, LGTM! 🚀