add button to sign up for events

index.html

@@ -16,6 +16,7 @@
         <header class="header">
             <h1>Nashua Codes</h1>
             <p>Free Programming Classes</p>
+            <a class="sub" href="http://eepurl.com/dPFsY1">Subscribe to Events!</a>
             <a class="arrowDown" onclick="scrollDown();"><i class="fas fa-chevron-circle-down fa-2x"></i></a>
         </header>
 
@@ -57,7 +58,7 @@
             </p>
         </section>
     </main>
-    <script src="main.js" type="text/javascript" />
+    <script src="main.js" type="text/javascript" ></script>
 </body>
 
 </html>