Created HackSIV Page & added it to the homepage headerbar

pages/hacksiv.tsx

@@ -0,0 +1 @@
+export { HackSIV as default } from '../src/hack-siv/HackSIV'

src/hack-siv/HackSIV.tsx

@@ -0,0 +1,3 @@
+export const HackSIV = (): JSX.Element => {
+  return <h1>Hack</h1>
+}

src/homepage/HeaderBar.tsx

@@ -12,6 +12,9 @@ export const HeaderBar = () => (
       </Link>
     </h3>
     <span>
+      <Link href="/hacksiv">
+        <a>Hack SIV</a>
+      </Link>
       <Link href="https://docs.siv.org">
         <a>Docs</a>
       </Link>