Fix Plus link

Author: reinink

src/components/header.tsx

@@ -153,7 +153,7 @@ export function Header(props: React.PropsWithChildren) {
           <Link href="/showcase" className="text-sm/6 text-gray-950 dark:text-white">
             Showcase
           </Link>
-          <a href="./plus?ref=top" className="group relative px-1.5 text-sm/6 text-sky-800 dark:text-sky-300">
+          <a href="/plus?ref=top" className="group relative px-1.5 text-sm/6 text-sky-800 dark:text-sky-300">
             <span className="absolute inset-0 border border-dashed border-sky-300/60 bg-sky-400/10 group-hover:bg-sky-400/15 dark:border-sky-300/30" />
             Plus
             <svg