feat: redesign compute capabilities section with dark theme

- Updated ComputeCapabilities component with dark background, bordered container layout, and improved visual hierarchy
- Replaced icon components with technology-specific images (Kubernetes, VM, Linux)
- Standardized button color scheme across components (gray to white outline variant)

src/pages/cloud/CloudArchitecture.tsx

@@ -75,7 +75,7 @@ export function CloudArchitecture() {
             <Button variant="solid" color="cyan" href="/start">
               Get Started
             </Button>
-            <Button variant="outline" color="gray" href="/docs">
+            <Button variant="outline" color="white" href="/docs">
               Explore Docs
             </Button>
           </div>