Added ImagineRIT header

Author: wilsonmcdade

src/templates/header.html

@@ -112,7 +112,7 @@ <h1>Devcade</h1>
       </div>
     </div>
     <div id="alertBar">
-      <h1>We're hosting a week-long Gamejam open to all RIT students! <b><a href="/gamejam">Learn more</a></b></h1>
+      <h1>Come see us in the Golisano Atrium during ImagineRIT! <b><a href="https://www.rit.edu/imagine/exhibits/devcade">Learn more</a></b></h1>
     </div>
     <div class="header">
       <img