docs(www): link get started to installation

apps/www/app/(app)/page.tsx

@@ -50,7 +50,7 @@ export default function IndexPage() {
         <PageHeaderDescription>{description}</PageHeaderDescription>
         <PageActions>
           <Button asChild size="sm">
-            <Link href="/docs">Get Started</Link>
+            <Link href="/docs/installation">Get Started</Link>
           </Button>
           <Button asChild size="sm" variant="ghost">
             <Link href="/blocks">Browse Blocks</Link>

apps/www/components/main-nav.tsx

@@ -20,10 +20,12 @@ export function MainNav() {
       </Link>
       <nav className="flex items-center gap-4 text-sm xl:gap-6">
         <Link
-          href="/docs"
+          href="/docs/installation"
           className={cn(
             "transition-colors hover:text-foreground/80",
-            pathname === "/docs" ? "text-foreground" : "text-foreground/80"
+            pathname === "/docs/installation"
+              ? "text-foreground"
+              : "text-foreground/80"
           )}
         >
           Docs