style: remove legacy category buckets from homepage stack section

Author: TechStack Global

index.html

@@ -98,22 +98,7 @@ <h2>Explore the Stack</h2>
                     <h3>Amazon Reviews</h3>
                     <p>Standardized hardware benchmarks</p>
                 </a>
-                <a href="/blog.html?cat=saas" class="cat-card">
-                    <i class="fa-solid fa-layer-group"></i>
-                    <h3>SaaS Tools</h3>
-                </a>
-                <a href="/blog.html?cat=ai" class="cat-card">
-                    <i class="fa-solid fa-brain"></i>
-                    <h3>AI Software</h3>
-                </a>
-                <a href="/blog.html?cat=assets" class="cat-card">
-                    <i class="fa-solid fa-photo-film"></i>
-                    <h3>Digital Assets</h3>
-                </a>
-                <a href="/blog.html?cat=productivity" class="cat-card">
-                    <i class="fa-solid fa-chart-line"></i>
-                    <h3>Productivity</h3>
-                </a>
+
                 <!-- Future Stacks (Placeholders) -->
                 <div class="cat-card placeholder-cat">
                     <i class="fa-solid fa-code-compare"></i>