refactor: update CallToAction "Join the Network" button to scroll to download section instead of node-how-it-works

- Changed smoothScrollToElement target from 'node-how-it-works' to 'download' section
- Maintained 1200ms scroll duration

src/pages/network/CallToAction.tsx

@@ -51,7 +51,7 @@ Use the network to link environments, deploy workloads, or host nodes to strengt
 
             {/* ✅ Two cards, stacked center with spacing */}
             <div className="mt-10 flex flex-wrap justify-center items-center gap-x-6 gap-y-4">
-              <Button variant="solid" color="cyan" onClick={() => smoothScrollToElement('node-how-it-works', 1200)}
+              <Button variant="solid" color="cyan" onClick={() => smoothScrollToElement('download', 1200)}
                             >
                 Join the Network
               </Button>