add registration

public/index.html

@@ -18,6 +18,7 @@
       <h2 class="subtitle">
         Mason CC's first CTF<br/>November 3rd, 9:30am to 5:30pm
         <br />The Hub Rooms 1-5
+        <br /><a href="https://go.gmu.edu/patriotctf">Registration is open</a>
       </h2>
     </div>
   </div>