style: improve GitHub link visibility with whitesmoke default and clearer blue hover

- Change default color from accent-blue to whitesmoke for better visibility
- Add clearer light blue hover color (#66B3FF instead of dark blue)
- Add smooth color transition on hover
- Remove inline color style, use CSS class instead

static/css/main.css

@@ -1107,6 +1107,16 @@ footer {
     font-size: 0.85rem;
 }
 
+/* GitHub repository link styling */
+.github-repo-link {
+    color: whitesmoke !important;
+    transition: color 0.2s ease-in-out;
+}
+
+.github-repo-link:hover {
+    color: #66B3FF !important;
+}
+
 
 /* CV Version Toggle Animations */
 @keyframes fadeInGrow {